Universe Today

Close-up view of Apollo 12 landing site from LRO. Credit: NASA/GSFC/Arizona State University

Wow! Just look at the detail visible in this image of the Apollo 12 landing site taken by the Lunar Reconnaissance Orbiter from its lower mapping orbit of 50 km above the surface. Compared to earlier images taken in September when LRO was in a higher orbit, the Lunar Module descent stage really stands out, as well as the Apollo Lunar Surface Experiment Package (ALSEP). Also visible are the trails left by spacewalking astronauts. From this and other LROC landing site images, it is clear that astronaut activity lowers the albedo, or reflectivity of the surface. Areas of heaviest activity have the lowest albedo, especially around the LM. NASA says this effect is most likely due to compaction of a very loose surface powder by the astronauts just walking around.

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Filed under: Moon | 8 Comments »

Ever heard of a 'Cyborg Astrobiologist'? Probably not. But I bet you'll want to be one after learning that future exploration of Mars (and other planets, for that matter) may employ the use of artificial intelligence integrated into spacesuits to enhance the ability of astronauts in taking scientific data while exploring. The AI assistance could help future astronauts exploring planets to recognize differences in their surroundings as being due to the presence of life. Does this sound like something from 50 years from now? Well, a prototype model has already been tested, and has shown the principle behind this idea to be sound.

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Filed under: Astrobiology, Mars, Technology | 4 Comments »

NASA's Spitzer Space Telescope captured this infrared image of a giant halo of very fine dust around the young star HR 8799. Image credit: NASA/JPL-Caltech/Univ. of Ariz.

Just what is going on over at the star HR 8799? The place is a mess! But we can just blame it on the kids. Young, hyperactive planets circling the star are thought to be disturbing smaller comet-like bodies, causing them to collide and kick up a huge halo of dust. HR 8799 was in the news in November 2008, for being one of the first with imaged planets. Now, NASA's Spitzer Space Telescope has taken a closer look at this planetary system and found it to be a very active, chaotic and dusty system. Ah, youth: our solar system was likely in a similar mess before our planets found their way to the stable orbits they circle in today.
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Filed under: Extrasolar Planets, Spitzer | 2 Comments »

The comet chasing spacecraft Rosetta will make its third and final swing by the Earth on November 13th to pick up more speed for the last part of a 10-year journey that lies ahead. Its mission is to place a lander on comet 67P/Churyumov-Gerasimenko and chase the comet for an entire year on its orbit around the Sun. The spacecraft will be visible to observers from the ground in certain locations on the Earth. This last flyby will increase the spacecraft's speed by 3.6 km/s (2.2 miles/s) with respect to the Sun, giving Rosetta the energy it needs to boost it to the outer regions of the Solar System. Click to continue…

Filed under: Comets, esa | 1 Comment »

A Chandra X-ray Observatory image of the supernova remnant Cassiopeia A. Credit: NASA/CXC

Supernova remnant Cassiopeia A (Cas A) has always been an enigma. While the explosion that created this supernova was obviously a powerful event, the visual brightness of the outburst that occurred over 300 years ago was much less than a normal supernova, — and in fact, was overlooked in the 1600's — and astronomers don't know why. Another mystery is whether the explosion that produced Cas A left behind a neutron star, black hole, or nothing at all. But in 1999, astronomers discovered an unknown bright object at the core of Cas A. Now, new observations with the Chandra X-Ray Observatory show this object is a neutron star. But the enigmas don't end there: this neutron star has a carbon atmosphere. This is the first time this type of atmosphere has been detected around such a small, dense object.
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The X-Prize competition for building a lander vehicle capable of making a simulated landing and liftoff on the Moon has come to a close, with the 1st place, $1 million award going to Masten Space Systems for their vehicle, Xoie (pronounced like the name 'Zoey'). Armadillo Aerospace came in a close second, and received $500,000 for their Scorpius rocket. The Northrop Grumman Lunar Lander X-Prize challenge was initiated to spur development of lunar landing vehicle by a privately funded institution. The last of the challenge flights occured Friday, October 30th, and the competition came down to the wire, as Masten encountered problems on Wednesday and Thursday challenge windows that delayed their final flight to the last day of the challenge. Click to continue…

Filed under: Space Flight | 3 Comments »

New measurements of the cosmic microwave background (CMB) – the leftover light from the Big Bang – lend further support the Standard Cosmological Model and the existence of dark matter and dark energy, limiting the possibility of alternative models of the Universe. Researchers from Stanford University and Cardiff University produced a detailed map of the composition and structure of matter as it would have looked shortly after the Big Bang, which shows that the Universe would not look as it does today if it were made up solely of 'normal matter'. Click to continue…

Filed under: Cosmology | 49 Comments »

We regularly report on the discovery of extrasolar planets in our galaxy, but earlier this year came news of possibly the first planet discovered outside of the Milky Way. Now comes news of the potential discovery of dozens of extragalactic planetary systems. Erin Mentuch and her colleagues at the University of Toronto in Canada have analyzed 88 remote galaxies and found a broad continuum excess in the near-infrared. They conclude the most likely explanation for the 2-5 micron excess is the light from circumstellar disks, or young solar systems, forming around massive young stars. "[This] presents us with an exciting opportunity to measure the formation rate of planetary systems at cosmic epochs before our own Solar System formed," the team writes in their paper.
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Filed under: galaxies | 9 Comments »

The U.S. Air Force began upgrading its ability to predict possible collisions in space after two satellites collided in February 2009, and has now done a collision analysis on over 800 maneuverable satellites. They hope to be able to track 500 more non-maneuvering satellites by year's end. But maneuverable satellites aren't the problem. The amount of space debris has risen by 40 per cent in the past four years alone. The Air Force Space Command now tracks 21,000 orbiting objects that are 10 centimeters or more across – including the 800 working satellites – and estimates that there are 500,000 smaller fragments in orbit.
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Filed under: Space Flight | 15 Comments »

Even though the MESSENGER spacecraft experienced a "hiccup" during its third and final flyby of Mercury on Sept. 29, scientists are still pleased and surprised by the data garnered. The spacecraft went into safe mode, shutting down temporarily because of a power system switchover during a solar eclipse as it approached the planet and only half of the expected observations were carried out. But the new data – combined with observations from the two previous flybys — provide an almost complete view of Mercury's surface and offer new, unexpected scientific findings. "Although the area viewed for the first time by spacecraft was less than 350 miles across at the equator, the new images reminded us that Mercury continues to hold surprises," said principal investigator Sean Solomon.
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Filed under: Mercury | 8 Comments »

Here's some great additional footage from the Ares I-X flight taken from a chase plane, which shows the entire flight, including booster separation and parachute deploy — and the problems that happened with the parachutes. The video was taken from a Cessna Skymaster aircraft positioned approx. 10 nautical miles away from the vehicle at an altitude of 12,000 feet. The videographer used a gyro-stabilized high-definition camera system mounted to the outside of the aircraft to capture this spectacular footage which provides extremely valuable engineering data, and imagery of the recovery sequence in rarely-seen detail. This provides NASA with additional critical data from vehicle ascent, booster deceleration and parachute deploy.
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Filed under: Constellation | 8 Comments »

This 3D illustration shows the position of the galaxies and reveals the extent of this gigantic structure. The galaxies located in the newly discovered structure are shown in red. Galaxies that are either in front or behind the structure are shown in blue. Credit: ESO

Are there "skeletons" out in the Universe –structures that form the framework of how galaxies are distributed? Astronomers have tracked down a gigantic, previously unknown assembly of galaxies located almost seven billion light-years away from us, which seems to point to a prominent galaxy structure in the distant Universe, providing further insight into the cosmic web and how it formed. “Matter is not distributed uniformly in the Universe,” says Masayuki Tanaka from ESO, who led the new study. “In our cosmic vicinity, stars form in galaxies and galaxies usually form groups and clusters of galaxies. The most widely accepted cosmological theories predict that matter also clumps on a larger scale in the so-called ‘cosmic web’, in which galaxies, embedded in filaments stretching between voids, create a gigantic wispy structure.”
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Filed under: galaxies | 111 Comments »

Carolyn Porco, the lead for Cassini's imaging team, warned on Twitter that the flyby of Saturn's moon Enceladus performed by the spacecraft on Nov. 2 wasn't really an "imaging" flyby, and that we might have to wait until the Nov. 21 flyby for really good images. But just take a look the images returned so far, with stunning looks at the jets shooting from the moon! Another image takes a close look at the surface. These are raw, unprocessed images, but what images they are! This is the second image from today's flyby returned by the spacecraft. See below for more.
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Filed under: Saturn | 14 Comments »

Even though most of us have been suffering from poor seeing conditions due to both hemisphere's seasonal climate changes, the changes we're experiencing look like nothing compared to what's happening on Jupiter. If you think we've got turbulent atmosphere and more than our fair share of clouds – then check out what John Chumack's been watching! Click to continue…

Filed under: Astrophotos, Jupiter | 4 Comments »

NASA Administrator Charles Bolden has restructured the NASA Advisory Council (NAC), adding several new committees in key areas of importance to the agency's future, including Education and Public Outreach, led by former CNN anchor Miles O'Brien and a Commercial Space, Information Technology Infrastructure committee led by Brett Alexander, the executive director of the Commercial Spaceflight Federation. "I consider the NASA Advisory Council to be an extremely important external advisory group, one that is uniquely capable to advise me and the entire NASA senior leadership team on some of the important decisions our agency will face in the coming months and years," Bolden said. "I am confident that this new structure will serve as an effective forum to stimulate meaningful advice to me and the rest of NASA's leadership."
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Filed under: NASA | 1 Comment »