A NASA Black Brant IX sounding rocket soars skyward into an aurora over Alaska during the launch on 5:13 a.m. EST, Feb. 22, 2017. Credit: NASA/Terry Zaperach
Not only is it aurora season in Alaska, its sounding rocket season! NASA started launching a series of five sounding rockets from the Poker Flat Research Range in Alaska to study the aurora. The first of these rockets for this year, a Black Brant IX, was launched in the early morning hours of February 22, 2017.
The instrument on board was an Ionospheric Structuring: In Situ and Groundbased Low Altitude StudieS (ISINGLASS) instrumented payload, which studies the structure of an aurora.
The Black Brant IX sounding rocket carried instruments to an altitude of 225 miles as part of the Ionospheric Structuring: In Situ and Groundbased Low Altitude StudieS or ISINGLASS mission. Credit: NASA/Terry Zaperach.
This is not the first sounding rocket flight from Poker Flats to launch into an aurora. Starting in 2009, this research has been taking place to help refine current models of aurora structure, and provide insight on the high-frequency waves and turbulence generated by aurorae. This helps us to better understand the space weather caused by the charged particles that come from the Sun and how it impacts Earth’s lower atmosphere and ionosphere.
“The visible light produced in the atmosphere as aurora is the last step of a chain of processes connecting the solar wind to the atmosphere,” said Kristina Lynch, ISINGLASS principal investigator from Dartmouth College. “We are seeking to understand what structure in these visible signatures can tell us about the electrodynamics of processes higher up.”
While humans don’t feel any of these effects directly, the electronic systems in our satellites do, and as our reliance on satellite technologies grow, researchers want to have all the data they can to help avert problems than can be caused by space weather.
The rocket sent a stream of real-time data back before landing about 200 miles downrange shortly after the launch.
The launch window for the remaining rockets runs through March 3. ISINGLASS will fly into what is known as a dynamic Alfenic curtain, which is a form of electromagnetic energy thought to be a key driver of “discrete” aurora – the typical, well-defined band of shimmering lights about six miles thick and stretching east to west from horizon to horizon.
NASA says that the five launches in the 2017 sounding rocket campaign will add to our body of information about this space through which our spacecraft and astronauts travel near Earth. By studying the interaction of the sun and its solar wind with Earth’s upper atmosphere, scientists are also able to apply the knowledge to other planetary bodies — helping us understand these interactions throughout the universe as well.
Here’s an infographic from NASA about the 2017 sounding rocket launches from Poker Flats:
The May 2012 annular eclipse. Image credit and copyright: Kevin Baird.
The May 2012 annular solar eclipse. Image credit and copyright: Kevin Baird.
‘Tis the season… eclipse season that is, as a spectacular “ring of fire” annular solar eclipse marks the end of the first of two eclipse cycles for 2017. And although the annular path for this eclipse passes through some sparsely populated parts of the southern hemisphere, we just might get some amazing live views, courtesy of modern technology and some intrepid observers willing to adventurously trek after the shadow of the Moon.
Unlike many of the uncertainties in life, eclipses are sure to happen, a certainty ordained by orbital mechanics. Well, okay, the Vogons could always blow the Moon to smithereens this fine Thursday afternoon… but otherwise, we’re in for a true celestial show.
Eclipse circumstances: Prospects and prognostications.
The eclipse begins far out in the South Pacific at sunrise, and the path of annularity makes first landfall along the southern coast of Chile at 13:31 Universal Time (UT). The eclipse antumbra then races eastward over Argentina at 2.5 kilometers per second, as the “ring of fire” heads out over the South Atlantic where it reaches “maximum annularity” of just 44 seconds 900 kilometers southeast of Brazil. Finally, the 30 kilometer wide path touches down over Angola, nicks Zambia and ends at sunset over a southern track along the Democratic Republic of the Congo. The eclipse is partial across southern portion of South America, the Falkland Islands a swath of Antarctica and southwestern Africa.
The aspects of the February 26th, 2017 annular eclipse. Credit: F.Espenak/NASA/GSFC
Here are the partial prospects for select cities:
City – Maximum obscuration – Time
La Paz, Bolivia – 5% – 13:37 UT
Buenos Aires – 67% – 13:53 UT
The Falkland Islands – 71% – 13:56 UT
Palmer Station, Antarctica – 31% – 14:01 UT
Cape Town, South Africa – 41% – 15:59 UT
Luanda, Angola – 83% – 16:32 UT
An animation of Sunday’s eclipse. Credit: NASA/GSFC/A.T. Sinclair
Annular vs. Total
Sunday’s eclipse is the first of two solar eclipses for 2017, and the only annular eclipse for the year. We get an annular eclipse when the Moon is near apogee (which occurred eight days ago on February 18th) and the Earth is near perihelion (which occurred last month on January 4th). At this time, the apparent size of the Moon is too small to cover the Sun as seen from the Earth, resulting instead in a brilliant annulus or “ring of fire” in the sky. Likewise, we refer to the shadow trace of this ring across the Earth as an antumbra, instead of the familiar umbra of a total solar eclipse.
Strange as it may seem, annular eclipses are slightly more common than total solar eclipses in our current epoch, and will become increasingly more so as the Moon slowly recedes from the Earth.
Unlike a total solar eclipse, safety precautions must be taken during all phases of an annular solar eclipse. We witnessed the 1994 annular eclipse from the shores of Lake Erie, and can attest that 1% of the Sun is still pretty darn bright. Use only telescope and camera filters or glasses designed specifically for solar observing, even during the annular phase. Venus should also be a splendid sight for those observing near sunset from Africa, as the Cytherian world shines at -4.3 magnitude 34 degrees east of the Sun. Viewers in southwestern African nations will also be treated to a setting Sun during the eclipse, affording the chance to include the spectacle in shots along with foreground objects on the local horizon if skies are clear.
The eclipse versus Venus as seen from the path through Angola. Credit: Stellarium.
Clouded out? Live on the wrong part of the planet? There are actually several options to watch the eclipse live:
Time and Date will provide a webcast starting at 12:05 UT from Angola:
Watch this space: we’ll be dropping in more live webcasts of the eclipse as they turn up.
Update: VTR Chile may provide a live broadcast come eclipse time.
Plan on doing an ad hoc webcast of Sunday’s eclipse from anywhere along the annular or partial track? Let us know!
Sunspot activity is currently at a lull, and the Earthward face of Sol may well be blank come eclipse day. At an eclipse magnitude of 99.22%, this eclipse juuuusst misses being a hybrid/total. It’s also possible to catch the brief flashes of Bailey’s Beads along the edge of the antumbral graze line.
Tales of the Saros
This eclipse is member 29 of 71 for saros cycle 140, stretching all the way back to April 16th, 1512 and running out to June 1st, 2774. If you caught the February 16th, 1999 annular eclipse from the Australian Outback, then you witnessed the last eclipse in saros 140. Stick around until March 9th, 2035 and you can then complete an exeligmos or triple saros cycle, joining an elite club of eclipse-chasing adventurers, indeed.
Eclipses occur in pairs or sometimes triplets, when the nodes where the Moon’s orbit intersect the position of the Sun and the Earth’s shadow along the ecliptic plane. These nodes move due to orbital precession of the Moon’s path around the Earth. If the Moon weren’t inclined relative to the ecliptic, we’d see a lunar and solar eclipse every synodic month. The February 11th penumbral eclipse ushered in the current eclipse season, which ends with this weekend’s annular eclipse.
The penumbral eclipse from earlier this month, ushering in eclipse season 1 of 2 for 2017. Credit and Copyright: Rob Sparks.
ISS and Views from Space (-ace -ace) Prospects
There is an ISS transit over SW Africa at around 15:45 UT, offering a chance to catch a transit of the station across the partially eclipsed Sun. Sun observing spacecraft in low Earth orbit including Hinode and Proba-2 also usually get good views of the eclipse.
New Moon sightings: And for the rest of the world, the hunt will be on to recover the slim waxing crescent Moon post-eclipse on the evening of Monday, February 27th. This lunation, first sighting opportunity without optical assistance favors southeast Asia.
Then, its on to eclipse season number two, featuring a partial lunar eclipse on August 7th, and then the big ticket event: the total eclipse of the Sun spanning the contiguous United States from coast to coast. Umbraphiles have been planning for this one and its brief 160 seconds maximum of totality for well over a decade now, no lie. Where will YOU be?
SpaceX’s Dragon CRS-10 cargo vehicle is attached to the International Space Station on Feb 23, 2017 after early morning capture by astronauts Shane Kimbrough and Thomas Pesquet using the robotic arm and subsequent berthing at Earth facing port on the Harmony module. It will stay for a month. Credit: NASA
SpaceX’s Dragon CRS-10 cargo vehicle is attached to the International Space Station on Feb 23, 2017 after early morning capture by astronauts Shane Kimbrough and Thomas Pesquet using the robotic arm and subsequent berthing at Earth facing port on the Harmony module. It will stay for a month. Credit: NASA
KENNEDY SPACE CENTER, FL – A SpaceX Dragon supply ship jam packed with more than 2.5 tons of critical science gear, crew supplies and 40 mice successfully arrived this morning at the International Space Station (ISS) – where six humans from the US, Russia and France are living and working aboard.
Dragon reached the station four days after it was launched from the Kennedy Space Center (KSC) on Sunday, Feb. 19 on the first Falcon 9 rocket ever to blast off from historic launch pad 39A in a blaze of glory.
Astronauts Thomas Pesquet of ESA (European Space Agency) and station commander Shane Kimbrough of NASA deftly maneuvered the space station’s 57.7-foot (17.6-meter) Canadian-built Canadarm2 robotic arm to reach out and flawlessly capture the Dragon CRS-10 spacecraft at about 5:44 a.m. EST early Thursday, after it arrived at the station.
The SpaceX CRS-10 Dragon is pictured in the grips of the Canadarm2 shortly after its capture by astronauts Shane Kimbrough and Thomas Pesquet on Feb. 23, 2017. Credit: NASA TV
Pesquet and Kimbrough were working at the robotics work station inside the seven windowed Cupola module as they monitored Dragon’s approach for capture by the grappling snares on the terminus of the robotic arm this morning as the station was soaring over the northwest coast of Australia.
“Looks like we have a great Dragon capture,” said capcom astronaut Mike Hopkins.
“We want to congratulate all the teams working around the world for the successful arrival,” said Pesquet.
The million pound station is orbiting approximately 250 miles (400 km) above Earth.
SpaceX CRS-10 Dragon supply ship launched on Feb. 19, 2017 from NASA’s Kennedy Space Center in Florida successfully arrives at the International Space Station on Feb. 23, 2017 for capture and berthing at station port on the Harmony module. Credit: NASA
The commercial Dragon cargo freighter arrived about 16 minutes earlier than originally planned.
The duo were assisted by experienced NASA astronaut Peggy Whitson. The 57 year old Whitson will soon set a record for most time spent in space by an American on April 24.
The gumdrop shaped Dragon cargo freighter slowly and methodically approached the station and the capture point through the required approach corridor during the final stages of the orbital chase.
After hovering at the capture point in free drift at a distance of about 34 feet (11 m) from the orbiting outpost, the crew members extended the robotic arm and Dragon was successfully plucked from free space using Canardarm2 at the grapple fixture located on the side of the supply ship.
The entire thrilling approach and grappling sequence was broadcast live on NASA TV.
SpaceX Dragon arrives at the 30 meter hold point during final approach to International Space Station on Feb. 23, 2017 for capture and berthing at station port on the Harmony module. Credit: NASA
Robotics officers on the ground at the NASA’s Johnson Space Center then took over and berthed Dragon to the Earth facing port on the Harmony module at about 8 a.m. as the mated craft were soaring over central America.
16 latches and bolts on the stations Common Berthing Mechanism (CBM) will hold Dragon firmly in place for a hard mate to the stations Harmony module.
4 gangs of 4 bolts were driven into place with ground commands from the robotics officer to firmly bolt Dragon to the nadir port on Harmony.
The second stage capture and Dragon installation was confrmed at 8:12 a.m. Feb 23 as the craft were flying over the US East Coast.
“Today’s’ re-rendezvous has gone by the book,” said NASA commentator Rob Navias.
“Dragon systems are in excellent shape.”
“There have been no issues and everything has gone as planned.”
“Today was smooth sailing as Dragon arrived below the space station and maneuvered its way through a carefully choreographed procedure to the grapple position for rendezvous and capture.”
“Dragon is now firmly attached to the International Space Station and the crew will begin unloading critical science payloads and supplies this afternoon.”
“Today’s’ re-rendezvous has gone by the book,” said NASA commentator Rob Navias.
“Dragon systems are in excellent shape.”
“There have been no issues and everything has gone as planned.”
Yesterday’s rendezvous was automatically aborted when a bad bit of navigational data was uplinked to Dragons relative GPS navigation system as it was about 0.7 miles below the station.
“The Dragon’s computers received an incorrect navigational update, triggering an automatic wave off. Dragon was sent on a “racetrack” trajectory in front of, above and behind the station for today’s second rendezvous attempt.”
There was never any danger to the crew, space station or Dragon. It merely arrived a day later than planned as it is fully equipped to do if needed.
The SpaceX Dragon was successfully installed to the Harmony module a few hours after it was captured with the Canadarm2 by the crew on Feb 23, 2017. This artists concept shows the location of several visiting vehicles including Dragon, Soyuz and BEAM expandable module. Credit: NASA
CRS-10 counts as the company’s tenth scheduled flight to deliver supplies, science experiments and technology demonstrations to the International Space Station (ISS).
The Dragon is the first of two cargo craft arriving at the station over two consecutive days.
The unpiloted Russian Progress 66 supply ship launched yesterday from Baikonur is slated to arrive early Friday morning with 2.9 tons of supplies. It will automatically dock at the Pirs docking module at about 3:45 a.m., with a trio of Russian cosmonauts monitoring all the action.
After conducting leak checks, the crew plans to open the hatch to Dragon later today.
They will quickly begin removing the highest priority science investigations and gear first.
Dragon will remain at the station for about 30 days.
SpaceX Falcon 9 rocket and Dragon cargo ship rests horizontal atop Launch Complex 39A at the Kennedy Space Center on 17 Feb 2017 as work crews use the access room to load ‘late stow’ science experiments aboard Dragon – as seen from inside the pad perimeter. This is the first rocket launched from pad 39A since the retirement of NASA’s Space Shuttles in July 2011. Liftoff of the CRS-10 mission occurred on 19 Feb 2017. Credit: Ken Kremer/Kenkremer.com
1000 pounds of ‘late stow’ experiments were loaded the day before the originally planned Feb. 18 liftoff of the SpaceX Falcon 9 rocket.
Dragon was successfully launched from NASA’s Kennedy Space Center atop the 213-foot-tall (65-meter) SpaceX Falcon 9 rocket at 9:38 a.m. EST on Feb. 19, 2017 from historic Launch Complex 39A to low Earth orbit.
Raindrops keep falling on the lens, as inaugural SpaceX Falcon 9/Dragon disappears into the low hanging rain clouds at NASA’s Kennedy Space Center after liftoff from pad 39A on Feb. 19, 2017. Dragon CRS-10 resupply mission is delivering over 5000 pounds of science and supplies to the International Space Station (ISS) for NASA. Credit: Ken Kremer/kenkremer.com
Dragon is carrying more than 5500 pounds of equipment, gear, food, crew supplies, hardware and NASA’s Stratospheric Aerosol Gas Experiment III (SAGE III) ozone mapping science payload in support of the Expedition 50 and 51 crew members.
SAGE III will measure stratospheric ozone, aerosols, and other trace gases by locking onto the sun or moon and scanning a thin profile of the atmosphere. It is one of NASA’s longest running earth science programs.
Engineers at work processing NASA’s Stratospheric Aerosol and Gas Experiment III, or SAGE III instrument inside the Space Station Processing Facility at NASA’s Kennedy Space Center in Florida during exclusive visit by Ken Kremer/Universe Today in December 2016. Technicians are working in a super-clean ‘tent’ built in the SSPF high bay to protect SAGE III’s special optics and process the Ozone mapper for upcoming launch on the SpaceX CRS-10 Dragon cargo flight to the International Space Station in early 2017. Credit: Ken Kremer/kenkremer.com
The LIS lightning mapper will measure the amount, rate and energy of lightning as it strikes around the world from the altitude of the ISS as it orbits Earth. Its data will complement that from the recently orbited GLM lighting mapper lofted to geosynchronous aboard the NASA/NOAA GOES-R spacecraft instrument.
NASA’s RAVEN experiment will test autonomous docking technologies for spacecraft.
SAGE III and RAVEN were stowed in the Dragon’s unpressurized truck.
The research supplies and equipment brought up by Dragon will support over 250 scientific investigations to advance knowledge about the medical, psychological and biomedical challenges astronauts face during long-duration spaceflight.
The 40 mice will be used in a wound healing experiment to test therapies in microgravity.
An advanced plant growth habitat will launch soon to test better technologies for growing crops in space that could contribute to astronauts nutrition on long duration spaceflights.
SpaceX Dragon CRS-10 Cargo manifest from NASA:
TOTAL CARGO: 5489.5 lbs. / 2490 kg
TOTAL PRESSURIZED CARGO WITH PACKAGING: 3373.1 lbs. / 1530 kg
• Science Investigations 1613.8 lbs. / 732 kg
• Crew Supplies 652.6 lbs. / 296 kg
• Vehicle Hardware 842.2 lbs. / 382 kg
• Spacewalk Equipment 22.0 lbs. / 10 kg
• Computer Resources 24.2 lbs. / 11 kg
• Russian Hardware 48.5 lbs. / 22 kg
Historic maiden blastoff of SpaceX Falcon 9 rocket from Launch Complex 39A at the Kennedy Space Center) at 9:38 a.m. EDT on Feb 19, 2017, on Dragon CRS-10 resupply mission to the International Space Station (ISS) for NASA. Credit: Ken Kremer/kenkremer.com
Watch for Ken’s onsite CRS-10 mission reports direct from the Kennedy Space Center and Cape Canaveral Air Force Station, Florida.
Stay tuned here for Ken’s continuing Earth and Planetary science and human spaceflight news.
The six most distant known objects in the solar system with orbits exclusively beyond Neptune (magenta) all mysteriously line up in a single direction. Also, when viewed in three dimensions, they tilt nearly identically away from the plane of the solar system. Batygin and Brown show that a planet with 10 times the mass of the earth in a distant eccentric orbit anti-aligned with the other six objects (orange) is required to maintain this configuration. Credit: Caltech/R. Hurt (IPAC); [Diagram created using WorldWide Telescope.]
Last year, Caltech astronomers Mike Brown and Konstantin Batygin found indirect evidence for the existence of a large planet in the outer reaches of our Solar System — likely located out past Pluto — and since then, the search has been on. The latest research continues to show signs of an unseen planet, the hypothetical Planet 9.
Astronomers using the Gran Telescopio CANARIAS (GTC) in the Canary Islands looked at two distant asteroids called Extreme Trans Neptunian Objects’ (ETNOs), and spectroscopic observations show and their present-day orbits could be the result of a past interaction with a large “superearth”-type object orbiting the Sun at a distance between 300 to 600 AU.
Researchers say the orbits of asteroids 2004 VN112 and 2013 RF98 suggest that the two were once a binary asteroid which separated after an encounter a large body, with a mass of between 10 and 20 Earth masses.
“The similar spectral gradients observed for the pair 2004 VN112 – 2013 RF98 suggests a common physical origin,” said Julia de León, the first author of a new paper, and who is an astrophysicist at the Instituto de Astrofísica de Canarias (IAC). “We are proposing the possibility that they were previously a binary asteroid which became unbound during an encounter with a more massive object.”
Sequence of images taken with the Gran Telescopio CANARIAS (GTC) to identify one of the ETNO´s studied in this article, 2013 RF98, where one can see how it moves during four consecutive nights. Below, right, visible spectra obtained with the GTC of the two objects 2004 VN112 and 2013 RF98. The red lines show the gradients of the spectra. Credit: Julia de León (IAC).
To test their hypothesis, the team performed thousands of simulations to see how the poles of the orbits would separate as time went on. The results of these simulations suggest that a possible Planet 9 could have separated the pair of asteroids around 5 to 10 million years ago.
de León said this could explain, in principle, how these two asteroids, starting as a pair orbiting one another, became gradually separated in their orbits after an encounter with a much more massive object at a particular moment in time.
The tale of Planet 9 started in 2014, when astronomers Chad Trujillo and Scott Shepard were studying the motions of large objects in the Kuiper Belt and realized that a large planet in the outer Solar System must be altering orbits of several ETNOs the in Kuiper Belt.
Brown and Batygin were looking to verify or refute the research of Trujillo and Shepard, and they painstakingly analyzed the movement of various KBOs. They found that six different objects all seem to follow a very similar elliptical orbit that points back to the same region in space.
All the bodies were found to be inclined at a plane of about 30-degrees different from almost everything else in the Solar System. Brown said the odds of these orbits all occurring randomly are about 1 in 100.
But calculations revealed the orbits could be influenced by a massive planet way out beyond the orbit of Pluto, about 200 times further than the distance from the Sun to the Earth. This planet would be Neptune-sized, roughly 10 times more massive than Earth.
It hasn’t been found yet, but the hunt is on by large telescopes around the world, and a new citizen science project allows people around the world to join in the search.
The latest findings of by de León and team could help point the way to where Planet 9 might be lurking.
The rift in the Larsen C Ice Shelf. Credit: NASA/John Sonntag
Located along the east coast of the Antarctic Peninsula is the Larsen Ice Shelf. Named after the Norwegian Captain who explored the ice front back in 1893, this ice shelf has been monitored for decades due to its close connection with rising global temperatures. Essentially, since the 1990s, the shelf has been breaking apart, causing collapses of considerable intensity.
According to the British Antarctic Survey (BAS), the section of the ice sheet known as the Larsen C Ice Shelf could be experiencing a collapse of its own soon enough. Based on video footage and satellite evidence of the sizeable rift (which is 457 m or 15oo ft across) in the shelf, it is believed that an ice berg that is roughly 5,000 km² (1930.5 mi²) in size could be breaking off and calving into the ocean in the near future.
An ice shelf is essentially a floating extension of a land-based glacier. In this case, the Larsen Ice Shelf is seaborne section of the larger Larsen Glacier, which flows southeast past Mount Larsen and enters the Ross Sea just south of Victoria Land. These shelves often act as buttresses, holding back glaciers that flow down to the coast, thus preventing them from entering the ocean and contributing to rising sea levels.
In the past twenty-two years, the Larsen A and B ice shelves (which were situated further north along the Antarctic Peninsula) both collapsed into the sea. This resulted in the dramatic acceleration of glaciers behind them, as larger volumes of ice were able to flow down the coast and drop into the ocean. While Larsen C appeared to still be stable, in November of 2016, NASA noted the presence of a large crack in its surface.
This crack was about 110 kilometers (68 mi) long and was more than 91 m (299 ft) wide, reaching a depth of about 500 m (1,600 ft). By December, the rift had extended another 21 km (13 mi), which raised concerns about calving. In February of 2017, satellite observations of the shelf noted that the crack appeared to have grown further, which confirmed what researches from the MIDAS project had previously reported.
This UK-based Antarctic research project – which is based at Swansea University and Aberystwyth University in Wales and supported by the BAS and various international partners – is dedicated to monitoring the Larsen C ice shelf in Antarctica. Through a combination of field work, satellite observations, and computer simulations, they have catalogued how recent warming trends has caused seasonal melts of the ice shelf and affected its structure.
And in recent years, they have been monitoring the large crack, which has been fast-moving, and noted the appearance of several elongations. It was during the current Antarctic field season that members of the project filmed what the crack looked like from the air. In previous surveys, the glaciology research team has conducted research on the ice shelf using seismic techniques to survey the seafloor beneath it.
However, this past season, they did not set up on the ice shelf itself for fear of a calving event. Instead, they made a series of trips to and from the UK’s Rothera Research Station aboard twin otter aircraft. During an outing to retrieve some of their science equipment, the crew noted how the crack looked from above and started filming. As you can see from the footage, the rift is very wide and extremely long.
What’s more, the team estimates that if an iceberg from this shelf breaks off and falls into the ocean, it will likely be over three times the size of cities like London or New York City. And while this sort of thing is common with glaciers, the collapse of a large section of Larsen C could speed the flow of the Larsen Glacier towards the Antarctic Ocean.
As Dr Paul Holland, an ice and ocean modeller at the British Antarctic Survey, said in a recent press release:
“Iceberg calving is a normal part of the glacier life cycle, and there is every chance that Larsen C will remain stable and this ice will regrow. However, it is also possible that this iceberg calving will leave Larsen C in an unstable configuration. If that happens, further iceberg calving could cause a retreat of Larsen C. We won’t be able to tell whether Larsen C is unstable until the iceberg has calved and we are able to understand the behavior of the remaining ice. The stability of ice shelves is important because they resist the flow of the grounded ice inland. After the collapse of Larsen B, its tributary glaciers accelerated, contributing to sea-level rise.”
One of the greatest concerns about climate change is the feedback mechanisms it creates. In addition to increased warming trends caused by rising levels of CO² in the atmosphere, the melting of glaciers and the breakup of ice shelves can have a pronounced effect on sea levels. In the end, the depletion of glaciers in Antarctica could have dramatic consequences for the rest of the planet.
NASA's Spitzer Space Telescope captured this stunning infrared image of the center of the Milky Way Galaxy, where the black hole Sagitarrius A resides. Credit: NASA/JPL-Caltech
It might sound trite to say that the Universe is full of mysteries. But it’s true.
Chief among them are things like Dark Matter, Dark Energy, and of course, our old friends the Black Holes. Black Holes may be the most interesting of them all, and the effort to understand them—and observe them—is ongoing.
That effort will be ramped up in April, when the Event Horizon Telescope (EHT) attempts to capture our first image of a Black Hole and its event horizon. The target of the EHT is none other than Sagittarius A, the monster black hole that lies in the center of our Milky Way Galaxy. Though the EHT will spend 10 days gathering the data, the actual image won’t be finished processing and available until 2018.
The EHT is not a single telescope, but a number of radio telescopes around the world all linked together. The EHT includes super-stars of the astronomy world like the Atacama Large Millimeter Array (ALMA) as well as lesser known ‘scopes like the South Pole Telescope (SPT.) Advances in very-long-baseline-interferometry (VLBI) have made it possible to connect all these telescopes together so that they act like one big ‘scope the size of Earth.
The ALMA array in Chile. Once ALMA was added to the Event Horizon Telescope, it increased the EHT’s power by a factor of 10. Image: ALMA (ESO/NAOJ/NRAO), O. Dessibourg
The combined power of all these telescopes is essential because even though the EHT’s target, Sagittarius A, has over 4 million times the mass of our Sun, it’s 26,000 light years away from Earth. It’s also only about 20 million km across. Huge but tiny.
The EHT is impressive for a number of reasons. In order to function, each of the component telescopes is calibrated with an atomic clock. These clocks keep time to an accuracy of about a trillionth of a second per second. The effort requires an army of hard drives, all of which will be transported via jet-liner to the Haystack Observatory at MIT for processing. That processing requires what’s called a grid computer, which is a sort of virtual super-computer comprised of 800 CPUs.
But once the EHT has done its thing, what will we see? What we might see when we finally get this image is based on the work of three big names in physics: Einstein, Schwarzschild, and Hawking.
A simulation of what the EHT might show us. Image: Event Horizon Telescope Organization
As gas and dust approach the black hole, they speed up. They don’t just speed up a little, they speed up a lot, and that makes them emit energy, which we can see. That would be the crescent of light in the image above. The black blob would be a shadow cast over the light by the hole itself.
Einstein didn’t exactly predict the existence of Black Holes, but his theory of general relativity did. It was the work of one of his contemporaries, Karl Schwarzschild, that actually nailed down how a black hole might work. Fast forward to the 1970s and the work of Stephen Hawking, who predicted what’s known as Hawking Radiation.
Taken together, the three give us an idea of what we might see when the EHT finally captures and processes its data.
Einstein’s general relativity predicted that super massive stars would warp space-time enough that not even light could escape them. Schwarzschild’s work was based on Einstein’s equations and revealed that black holes will have event horizons. No light emitted from inside the event horizon can reach an outside observer. And Hawking Radiation is the theorized black body radiation that is predicted to be released by black holes.
The power of the EHT will help us clarify our understanding of black holes enormously. If we see what we think we’ll see, it confirms Einstein’s Theory of General Relativity, a theory which has been confirmed observationally over and over. If EHT sees something else, something we didn’t expect at all, then that means Einstein’s General Relativity got it wrong. Not only that, but it means we don’t really understand gravity.
In physics circles they say that it’s never smart to bet against Einstein. He’s been proven right time and time again. To find out if he was right again, we’ll have to wait until 2018.
Illustration showing the possible surface of TRAPPIST-1f, one of the newly discovered planets in the TRAPPIST-1 system. It's a very active flare star. Credits: NASA/JPL-Caltech
In what is surely the biggest news since the hunt for exoplanets began, NASA announced today the discovery of a system of seven exoplanets orbiting the nearby star of TRAPPIST-1. Discovered by a team of astronomers using data from the TRAPPIST telescope in Chile and the Spitzer Space Telescope, this find is especially exciting since all of these planets are believed to be Earth-sized and terrestrial (i.e. rocky).
But most exciting of all is the fact that three of these rocky exoplanets orbit within the star’s habitable zone (aka. “Goldilocks Zone”). This means, in effect, that these planets are capable of having liquid water on their surfaces and could therefore support life. As far as extra-solar planet discoveries go, this is without precedent, and the discovery heralds a new age in the search for life beyond our Solar System.
Features in the Hapi region show evidence of local gas-driven transport producing dune-like ripples (left) and boulders with ‘wind-tails’ (right) – where the boulder has acted as a natural obstacle to the direction of the gas flow, creating a streak of material ‘downwind’ of it. The images were taken with the OSIRIS narrow-angle camera on 18 September 2014. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
The Rosetta mission’s close-up views of the curiously-shaped Comet 67P/Churyumov-Gerasimenko have already changed some long-held ideas about comets. But here’s more: there’s a ‘wind’ blowing across the comet’s surface, creating moving shifting dunes.
“The approach to comet 67P/Churyumov–Gerasimenko by the spacecraft Rosetta has revealed the presence of astonishing dune-like patterns,” wrote Philippe Claudin, of the Institute of Industrial Physics and Chemistry, Paris, France, in his new paper, noting the unusual and unexpected conditions found on Comet 67P.
Images from Rosetta’s cameras revealed the dusty covering of the comet may be several meters thick in places, which was surprising. But even more surprising was seeing active dunes that are changing. The dunes were seen on both of the ‘lobes’ of the comet as well as on the neck that connects them. Comparisons images taken 16 months of the same region shows evidence that the dunes moved, and are therefore active.
Claudin and his team said that the formation of sedimentary dunes requires the presence of grains and of winds that are strong enough to transport them along the ground. However, comets do not have a dense, permanent and active atmosphere like Earth does. Also, Comet 67P’s gravity is so weak – only about 1/50,000 that of Earth’s – that fast moving grains might be ‘launched’ into space.
What could be creating a wind strong enough that not only moved the grains, but also some boulders up to a meter wide?
There is indeed a wind blowing along the comet’s surface, said Claudin, coming from gases that escape from the surface.
Gases escape at ‘sunset’ on the comet, caused by the pressure difference between the sunlit side, where the surface ice can sublimate due to the energy provided by the sunlight, and the night side.
“This transient atmosphere is still extremely tenuous, with a maximum pressure at perihelion, when the comet is closest to the Sun, 100,000 times lower than on Earth,” the team said in a press release. “However, gravity on the comet is also very weak, and an analysis of the forces exerted on the grains at the comet’s surface shows that these thermal winds can transport centimeter-scale grains, whose presence has been confirmed by images of the ground. The conditions required to allow the formation of dunes, namely winds able to transport the grains along the ground, are thus met on Chury’s surface.”
Summary of properties of Comet 67P/Churyumov–Gerasimenko, as determined by Rosetta’s instruments during the first few months of its comet encounter. Credit: ESA.
The transportation of dust has created dune-like ripples, and boulders with ‘wind-tails’ – the boulders act as natural obstacles to the direction of the gas flow, creating streaks of material ‘downwind’ of them.
Claudin said this finding represents a step forward in understanding the various processes at work on cometary surfaces, and also shows the Rosetta mission still has many surprises and discoveries in store.
Venus and Earth have many similarities. Both are terrestrial planets, meaning that they are composed predominately of metal and silicate rock, which is differentiated between a metal core and a silicate mantle and crust. Both also orbit the Sun within its habitable zone (aka. “Goldilocks Zone“). Hence why Venus and Earth are often called “sister planets”.
However, Venus is also starkly different from Earth in a number of ways. It’s atmosphere, which is composed primarily of carbon dioxide and small amounts of nitrogen, is 92 times as dense as Earth’s. It is also the hottest planet in the Solar System, with temperatures hot enough to melt lead! And on top of all that, a year on Venus is much different than a year on Earth.
Orbital Period:
Venus orbits the Sun at an average distance of about 0.72 AU (108,000,000 km/67,000,000 mi) with almost no eccentricity. In fact, with its farthest orbit (aphelion) of 0.728 AU (108,939,000 km) and closest orbit (perihelion) of 0.718 AU (107,477,000 km), it has the most circular orbit of any planet in the Solar System.
Earth and Venus’ orbit compared. Credit: Sky and Telescope
The planet’s orbital period is 224.65 days, which means that a year on Venus is 61.5% as long as a year on Earth. Unlike most other planets in the Solar System, which rotate on their axes in an counter-clockwise direction, Venus rotates clockwise (called “retrograde” rotation). It also rotates very slowly, taking 243 Earth days to complete a single rotation.
Sidereal vs. Solar Day:
While a year on Venus lasts the equivalent of 224.65 Earth days, it only lasts the equivalent 1.92 days on Venus. This is due to the fact that Venus rotates quick slowly and in the opposite direction of its orbit. Because of this, a Solar Day – the time it takes for the Sun to rise, set, and return to the same place in the sky – takes 116.75 Earth days.
This means, in effect, that a single day on Venus lasts over half a year. In other words, in the space of just over a single Venusian year, the Sun will appear to have circled the heavens twice. In addition, to someone standing on the planet’s surface, the Sun would appear to rise in the west and set in the east.
Variations:
Because of its dense atmosphere and its highly circular rotation, Venus experiences very little in the way of temperature variations during the course of a year. Similarly, its axial tilt of 2.64° (compared to Earth’s 23.44°) is the second-lowest in the Solar System, behind Mercury’s extremely low tilt of 0.03.
This means that there is virtually no variation in Venus’ surface temperature between day and night, or the equator and the poles. All year long, the mean surface temperature of Venus is a scorching 735 K (462 °C/863.6 °F), with the only variations occurring as a result of elevation.
Yes, Venus is a truly hellish place. And unfortunately, that’s a year-round phenomena! The days are extremely hot, the nights extremely hot, and a day lasts over half as long as a year. So if you’re planning on vacationing somewhere, might we recommend somewhere a little less sunny and balmy?
Artist's concept for a possible colony on Mars, which the United Arab Emirates indicated it is committed to building by 2117. Credit: Ville Ericsson
Elon Musk has been rather outspoken in recent years about his plan to create a human settlement on Mars. Stressing the need for a “backup location” for humanity, he has dedicated his company (SpaceX) to the creation of a reusable spacecraft (aka. the Interplanetary Transport System) that in the coming decades will be able to transport one-hundred people at a time to Mars.
In addition to Musk, Dutch entrepreneur Bas Lansdorp has also expressed an interest in creating a permanent settlement on Mars. In 2012, he founded MarsOne with the intent of developing the necessary expertise to mount one-way trips to the Red Planet by 2032. And according to an announcement from the government of Dubai, it seems they aren’t the only ones looking to colonize the Red Planet.
The announcement came on February 14th, 2017, during the 5th World Government Summit – which was held this year in Dubai. In the midst of presentations by notaries like Ban-Ki-Moon, Elon Musk, and Barack Obama, Sheikh Mohammed bin Rashid Al Maktoum and Sheikh Mohamed bin Zayed Al Nahyan shared their country’s vision of putting 600,000 humans on the Red Planet by the next century – known as the “Mars 2117 Project”.
In the course of his speech, Sheikh Mohammed emphasized the UAEs commitment to space sciences and its desire to accomplish one of the longest-held dreams of humanity:
“Human ambitions have no limits, and whoever looks into the scientific breakthroughs in the current century believes that human abilities can realize the most important human dream. The new project is a seed that we plant today, and we expect future generations to reap the benefits, driven by its passion to learn to unveil a new knowledge. The landing of people on other planets has been a longtime dream for humans. Our aim is that the UAE will spearhead international efforts to make this dream a reality.”
As growing investors in the field of space research, Sheikh Mohammed indicated that this project will accelerate the UAE’s commitment in this regard. Recent accomplishments by the Emirati space program include the successful deployment of the UAE’s first nanosatellite – Nayif-1 – which was launched a day after the Mars 2117 announcement (Feb. 15th, 2017).
This nanosatellite was the result of collaborative work between the Mohammed bin Rashid Space Centre (MBRSC) and the American University of Sharjah (AUS). Its intended purpose is to provide opportunities and hands-on experience for Emirati engineering students, as well as developing expertise in the designing, building, testing and operating of nanosatellites.
And then there’s the Hope Spacecraft, a project which was commissioned in 2015 by the Emirates Mars Mission. This project calls for the creation of a compact, hexagonal spacecraft that will reach the Red planet by 2021 and spend the next two years studying its atmosphere and weather. Not only is this mission designed to provide the first truly global picture of the Martian atmosphere, it will also be the first orbiter deployed by an Arab country.
Meanwhile, Sheikh Mohamed bin Zayed – the Crown Prince of Abu Dhabi and the Deputy Supreme Commander of the UAE Armed Forces – said that the objective of the project is to develop the skills and capacities of the UAE’s space program. He also indicates that the project will benefit research institutions and advance the fields of transportation, energy and food production here on Earth.
The “Mars 2117” project will develop an Emirati and international team of scientists to push the human exploration of Mars in years to come. pic.twitter.com/5ujxvyC8As
“Mars 2117” is a seed we are sowing today to reap the fruit of new generations led by a passion for science and advancing human knowledge. pic.twitter.com/IExtnpiO2B
“The Mars 2117 Project is a long term project, where our first objective is to develop our educational system so our sons will be able to lead scientific research across the various sectors,” he said. “The UAE became part of a global scientific drive to explore space, and we hope to serve humanity through this project.”
Elements of the project were showcased at the Summit by a team of Emirati engineers, scientists and researchers – which included a concept for a human city that would be built by robots. It also showcased aspects of the inhabitants’ lifestyle, like the transportation they would use, how they would generate power, how they would grow food, the infrastructure they would build, and the materials that would be used to construct the colony.
An artist’s illustration of an early Mars settlement. Credit: Bryan Versteeg/MarsOne
Given the long-term nature of this project, it will be broken down into multiple phases that will take place over the next few decades. Phase One will focus on preparing the scientists who will attempt to address all the challenges and concerns of sending human beings on a one-way trip to Mars. At the same time, the project calls for the creation of an Emiratis science team that will work with the international scientific community to speed up the research efforts.
Particular areas of concern will include creating spacecraft that are fast enough to ferry people to and from Earth in a respectable time frame. Then there’s the task of creating a working model of what the settlement will look like, and how the needs of its inhabitants will be met. Naturally, this will include methods for growing food and seeing to the health, safety, transportation, and energy needs of the colonists.
In the future, the UAE also anticipates that uncrewed missions will be mounted to explore the surface of Mars and locate a possible site for the future colony. In short, they are not only joining the “Mars or Bust” club, but also the international community of space explorers.
