Hubble’s Heritage

Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA) Acknowledgment: N. Smith (University of California, Berkeley)

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Here’s another anniversary for you and more fodder to either ease or add to your Hubble “angst”: Ten years ago, the Hubble Heritage Project began. What is Hubble Heritage? After the Hubble Space Telescope was fixed of its spherical aberration problem in December of 1993, HST started churning out incredible images. After a few years, the images started to pile up, and the astronomers working with Hubble wanted to share them with the public. So with the Hubble Heritage Project, each month, some of the most breathtaking and attractive images are released and showcased to the public. Along with the images, the astronomers explain the science behind the images, as well. Over the past ten years of doing this, the Heritage team has presented to the public aesthetic images that present the universe from an artistic perspective. Its science as art, and these images are some of the most gorgeous “real” art available anywhere. To celebrate the 10th anniversary of this project, above is the latest release. So while we await the fate of Hubble, enjoy this latest release!

This month’s three-dimensional-looking Hubble image shows the edge of the giant gaseous cavity within the star-forming region called NGC 3324. The glowing nebula has been carved out by intense ultraviolet radiation and stellar winds from several hot, young stars. A cluster of extremely massive stars, located well outside this image in the center of the nebula, is responsible for the ionization of the nebula and excavation of the cavity.

The image also reveals dramatic dark towers of cool gas and dust that rise above the glowing wall of gas. The dense gas at the top resists the blistering ultraviolet radiation from the central stars, and creates a tower that points in the direction of the energy flow. The high-energy radiation blazing out from the hot young stars in NGC 3324 is sculpting the wall of the nebula by slowly eroding it away.

Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA)  Acknowledgment: N. Smith (University of California, Berkeley)
Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA) Acknowledgment: N. Smith (University of California, Berkeley)

Located in the southern hemisphere, NGC 3324 is at the northwest corner of the Carina Nebula (NGC 3372), home of the Keyhole Nebula and the active, outbursting star Eta Carinae. The entire Carina Nebula Complex is located at a distance of roughly 7,200 light-years, and lies in the constellation Carina.

This image is a composite of data taken with the Advanced Camera for Surveys (ACS) and the Wide Field Planetary Camera 2 (WFPC2).

The Hubble Heritage Project, which began in October 1998, has released nearly 130 images mined from the Hubble data archive as well as a number of observations taken specifically for the project.

Source: Hubble Heritage , HubbleSite

The Particle Zoo: Collecting Your Own Subatomic Particles

All the particles (excluding their anti-particles) gather for a photo opportunity (Particle Zoo)

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This is a must for any particle physics enthusiast: collect your own particles in the form of a soft, cuddly plushie. From the theoretical Higgs boson to the well known electron, all the quantum particles from the Standard Model can be browsed and chosen for your personal collection. The Particle Zoo is the brain child of Los Angeles-based Julie Peasley, who is making it her duty to give our beloved particles a face and personality. For example: due to his popularity, the Higgs particle is a “bit of a snob” and therefore has a huge smile on his face (after all, wouldn’t you be really smug if everyone wanted to interview you?); the muon (or heavy electron) “lives fast and dies young“; or, hilariously, the unobserved graviton “has big legs for jumping branes.” All the particles have a story and a loving personality. Who would have thought quantum physics could be so much fun?

So that's what the LHC is looking for! Meet the Higgs particle (The Particle Zoo)
So that's what the LHC is looking for! Meet the Higgs particle (The Particle Zoo)
When I first stumbled across The Particle Zoo website I was in awe of the effort Particle Zookeeper Julie Peasley had put into her creations. On reading the descriptions of each particle’s personalities I realised these fun characters were more than just for entertainment purposes; they were a way to communicate the complex physics behind the quantum world to an audience who didn’t necessarily have a specialist background, but would appeal greatly to physicists too.

If the particle toys can generate an interest in physics and the subatomic world, I’m grateful. At the very least now all my friends and family know what a boson is,” Julie responded when I asked about the educational uses for these cute creations. Teachers, professors and science educators have ordered whole sets of the particles for use in their physics lessons, proving that The Particle Zoo is not simply ‘just for fun.’

Identifying a face and personality for all the quarks, leptons, bosons, nucleons and theoreticals is not a task to be taken lightly, however. Every characteristic of the professionally-made particles must be likened to their real-world counterpart, thereby ensuring scientific accuracy. If the particle is heavy, it will be filled with something weighty, like gravel (check out the vital statistics for the Higgs boson for example); if it is massless, it is filled with light weight poly fill (such as the photon).

The particles seem to be catching on more and more. I had a “special” on the Higgs particle all day on September 10 to celebrate the startup. I sold a record amount of particles in a short time. So I am now only $999,999,689 away from buying my own LHC.” – Particle Zookeeper Julie Peasley.

Julie spends some quality time with her Standard Model particles (The Particle Zoo)
Julie spends some quality time with her Standard Model particles (The Particle Zoo)
But there is a lot more to it than matching the physical characteristics of the quanta with the plushie. Julie realised after a compelling lecture by Dr. Lawrence Krauss at UCLA that subatomic particles could have different “personalities” that could be embodied through her talents as an artist (she holds a Fine Arts degree from the University of Colorado) and her lifelong interest in cosmology, the quantum mechanics and theoretical physics. After Krauss’ lecture on The Beginning and End of Time, she hit the textbooks, finding Lisa Randall’s Warped Passages to be a key element to her enthusiasm to giving the particles a face. Each particle has a face that reflects its “personality” – take the neutron with a neutral expression, or the hard-to-detect neutrinos who are all dressed up like little ninjas; every one is designed with a subtle touch.

Select your favourite particle (and don't forget your anti-particles!) (Particle Zoo)
Select your favourite particle (and don't forget your anti-particles!) (Particle Zoo)
In reference to the light-hearted organization, the People for the Ethical Treatment of Hadrons, or simply “PETH” (a group set up to protect the rights of hadrons in particle colliders. After all, how do we know protons don’t feel pain?), Julie said, “I love the idea of hadron’s rights, that is hilarious. Actually, I’m quite jealous of the little hadrons who get to collide at the LHC. They get to go 99.999999% the speed of light. How cool is that?

Although the LHC has suffered a technical hitch, and the first particle collisions aren’t expected to commence until spring 2009, The Particle Zoo will allow you to explore the quantum world for the time being. I for one have ordered my very own Higgs boson in preparation for my celebrations for when the first particles are collided by the LHC.

I had a collection of the Giant Microbes toys and thought if people enjoyed those, maybe they would enjoy taking it a step further (well, to be honest, many orders of magnitude further). I honestly had no idea if anyone would be interested but I’m happy to say I’ve gotten over and beyond the positive response I could have imagined.” – Particle Zookeeper Julie Peasley.

So for now, any Higgs boson discovery will fall to Julie’s skilled hands in her “sweatshop of one” until the real force carrier is either proven or disproven in a few months time…

(Warning: Be sure not to leave any anti-particles mingling with the “normal” particles on the same shelf… the resulting annihilation may leave you swamped with fluffy photons…)

Source: Astroengine.com

Little Star Twinkles, Then Vanishes

Illustration of the flare from magnetar Swift J195509+261406. A starquake is probably what triggered the object's 40 optical flares. Credit: NASA/Swift/Sonoma State University/A. Simonnet

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Swift has made another unusual discovery. The orbiting satellite detected a very strange star that “twinkled” with gamma rays, X-rays, and light — and then vanished. Back in June the satellite detected a spike of gamma-rays that lasted less than five seconds. But this high-energy flash wasn’t a gamma-ray burst — the birth cry of a black hole far across the universe. It was something much closer to home. During the next three days, the object brightened and faded in visible light. It flashed over 40 times! Eleven days later, it flashed again, this time at infrared wavelengths. Then, it disappeared from view!

Swift had reported the event’s position to astronomers all over the world, so within minutes, robotic telescopes turned to a spot in the constellation Vulpecula. It was cataloged as “Swift J195509+261406.” So, several astronomers had a look at this unusual object before it disappeared.

Astronomers think the object was a special kind of neutron star called a magnetar. “We are dealing with an object that was hibernating for decades before entering a brief activity period,” explains Alberto J. Castro-Tirado, lead author of the paper that was published in the Sept. 25 edition of Nature. “Magnetars remain quiet for decades.”

Although measuring only about 12 miles across — about the size of a city — neutron stars have the strongest magnetic fields in the cosmos. Sometimes, those magnetic fields are super strong — more than 100 times the strength of typical neutron stars.

Astronomers put these magnetic monsters in their own class: magnetars. Only about a dozen magnetars are known, but scientists suspect our galaxy contains many more. We just don’t see them because they’re quiet most of the time.

So what happened last year? Why did this previously unseen star begin behaving so badly? And why did it stop?

Combine a magnetar’s pumped-up magnetic field with its rapid spin, and sooner or later something has to give. Every now and then, the magnetar’s rigid crust snaps under the strain.

This “starquake” releases pent-up magnetic energy, which creates bursts of light and radiation. Once the star’s crust and magnetic field settle down, the star goes dark and disappears from our view. At least until the next quake.

Astronomers suspect that magnetars lose their punch as time passes, but Swift J195509+261406 provides the missing link between objects exhibiting regular activity and those that have settled into retirement — and invisibility.
“I love it when Swift enables a discovery like this,” says Neil Gehrels, the mission’s lead scientist at NASA Goddard Space Flight Center in Greenbelt, Md. “The observatory is an astronomical robot built for gamma-ray burst studies, but it can also quickly point at other bizarre objects with bright flares.”

Read two papers published on this object here and here.

Source: Goddard Spaceflight Center

The Telescope Has a Birthday Party

Galileo's Telescope

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All sorts of anniversaries going on these days — yesterday was NASA’s 50th birthday, on Saturday, Oct. 4 is the 51st anniversary of Sputnik’s launch, and today we celebrate the birthday of the telescope. 400 years ago, officials in the Netherlands were pondering over a patent application by a spectacle maker named Hans Lipperhey. The patent was for a “device by means of which all things at a very great distance can be seen as if they were nearby.” This is the earliest known record of a telescope. A few months later, scientist Galileo Galilei would get his hands on one.

Over at Wired, they are having a big celebration for the telescope’s birthday, including an article by some writer named Nancy Atkinson that includes a gallery of images and descriptions of the ten largest ground-based telescopes on Earth. It’s called “Giants of Earth and Space.” But there’s all sort of other interesting features, including a place where you can upload your favorite astronomical image that was taken by a ground-based telescope.

So check it out to celebrate. But of course this biggest party will be next year — the whole year of 2009 in fact, during the International Year of Astronomy. Look for more info and features about all the great events and ways you can participate in future articles on Universe Today

Best Ground-Based Image of Jupiter — Ever!

Jupiter from the VLT. Credit: ESO

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Everyone loves twinkling stars and moonlit nights—EXCEPT astronomers. But astronomers are crafty people, so they’ve come up with ways to mitigate the distortion that Earth’s thick atmosphere causes for ground based telescopes (from which stars appear to twinkle). And now, a new image-correction technique has delivered the sharpest whole-planet ground-based picture ever. The Very Large Telescope (VLT) performed a record two-hour observation of Jupiter using a breakthrough technique to remove atmospheric blur. And what a result! Just take a look at that gorgeous image…And this new image reveals changes in Jupiter’s smog-like haze, probably in response to a planet-wide upheaval more than a year ago.

Being able to correct wide field images for atmospheric distortions has been the dream of scientists and engineers for decades. Astronomers used a new device called the Multi-Conjugate Adaptive Optics Demonstrator (MAD) prototype instrument mounted on ESO’s Very Large Telescope (VLT)
The new images of Jupiter prove the value of the advanced technology used by MAD, which uses two or more guide stars instead of one as references to remove the blur caused by atmospheric turbulence over a field of view thirty times larger than existing techniques.

“This type of adaptive optics has a big advantage for looking at large objects, such as planets, star clusters or nebulae,” says lead researcher Franck Marchis, from UC Berkeley and the SETI Institute in Mountain View, California, USA. “While regular adaptive optics provides excellent correction in a small field of view, MAD provides good correction over a larger area of sky. And in fact, were it not for MAD, we would not have been able to perform these amazing observations.”

MAD allowed the researchers to observe Jupiter for almost two hours on 16 and 17 August 2008, a record duration, according to the observing team. They were able to take a series of 265 snapshots. Conventional adaptive optics systems using a single Jupiter moon as reference cannot monitor Jupiter for so long because the moon moves too far from the planet. The Hubble Space Telescope cannot observe Jupiter continuously for more than about 50 minutes, because its view is regularly blocked by the Earth during Hubble’s 96-minute orbit.

Using MAD, ESO astronomer Paola Amico, MAD project manager Enrico Marchetti and Sébastien Tordo from the MAD team tracked two of Jupiter’s largest moons, Europa and Io – one on each side of the planet – to provide a good correction across the full disc of the planet. “It was the most challenging observation we performed with MAD, because we had to track with high accuracy two moons moving at different speeds, while simultaneously chasing Jupiter,” says Marchetti.

With this unique series of images, the team found a major alteration in the brightness of the equatorial haze, which lies in a 16,000-kilometer wide belt over Jupiter’s equator. More sunlight reflecting off upper atmospheric haze means that the amount of haze has increased, or that it has moved up to higher altitudes. “The brightest portion had shifted south by more than 6,000 kilometers,” explains team member Mike Wong.

This conclusion came after comparison with images taken in 2005 by Wong and colleague Imke de Pater using the Hubble Space Telescope. The Hubble images, taken at infrared wavelengths very close to those used for the VLT study, show more haze in the northern half of the bright Equatorial Zone, while the 2008 VLT images show a clear shift to the south.

“The change we see in the haze could be related to big changes in cloud patterns associated with last year’s planet-wide upheaval, but we need to look at more data to narrow down precisely when the changes occurred,” declares Wong

Source: ESO

Astronaut vs. Earth: The World’s Most Extreme Chess Match Begins

Astronaut Greg Chamitoff contemplates his next move on the ISS (NASA)

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In one of the grandest chess challenges ever attempted, a Canadian space station astronaut will contemplate his moves from orbit whilst students on Earth will make theirs from the ground. Greg Chamitoff, an International Space Station (ISS) flight engineer, has been stationed on the orbital outpost for four months and he is filling his spare time following his favorite intellectual hobby. The chess enthusiast has been playing the board game with space centres around the world, and is so far undefeated. Let’s see if he can beat some of the brightest strategists from kindergarten through to a third grade US Chess Championship Team…

Many of you may be thinking: hasn’t a space station engineer got better things to do with his time rather than playing chess? And you would be right, Chamitoff has a busy schedule to maintain and only has a limited amount of recreational time on his hands. This is why only one move per day will be allowed. This slow game may even get longer should his orbital duties eat into his spare time. However, this is a great chance for the public to experience a rather unique chess match transmitted over an altitude of 210 miles.

For the past 10 years, the International Space Station has been an important platform to learn about living in space. We’re excited to have the opportunity to engage not only young students, but the public at large in this unique chess match,” said Heather Rarick, lead flight director for the current space station mission at NASA’s Johnson Space Center in Houston. After all, this match will not only boost interest for space exploration in the classroom, it might create many chess enthusiasts (after all, it’s not every day you get to challenge an astronaut to a board game).

US Chess Federation (USCF) Executive Director Bill Hall shares this sentiment. “Chess is a valuable tool to lead students to become interested in math and to develop critical thinking skills, objectives we focus on in our work with schools nationwide,” he said.

The match is focused on school children in kindergarten through to the third grade US Chess Championship Team, including chess club members from Stevenson Elementary School in Bellevue, Washington. The students choose four possible moves in reply to Chamitoff’s and then the public votes on the best move to be transmitted to orbit.

Chamitoff carried his custom-made chess set into orbit when he few on the STS-124 shuttle mission which delivered components for the Japanese Experiment Module, “Kibo”. Each chess piece is attached to the board with Velcro to prevent the pawns and knights from floating around the station’s Harmony module where the match is taking place. In the ISS video on the USCF website (the organization which set up the event), Chamitoff said after ripping his knight from g1, “It’s your move. Good luck. I’m not gonna make it easy for you. And thanks for playing!

Get over to the USCF website to make your vote on Planet Earth’s next move

Sources: USCF, NASA, Daily Mail

Reflections of NASA at 50

NASA turns 50 years old today. On Oct. 1, 1958 the National Advisory Council on Aeronautics (NACA) officially became the National Aeronautics and Space Administration. “It was a relatively easy transition,” said Apollo 11 astronaut Neil Armstrong in a rare public appearance commemorating NASA’s anniversary. “We were already riding on rockets and research aircraft…We had merely to paint over the “C” in NACA and replace it with an “S” on our airplanes, our trucks and vans.” But beyond those cosmetic changes, what has NASA meant to the average citizen, the US and the world?

Because of NASA, Armstrong said, “Our knowledge of the universe around us has increased a thousand fold and more. We learned that Homo sapiens was not forever imprisoned by the gravitational field of Earth. Performance, efficiency, reliability and safety of aircraft have improved remarkably. We’ve sent probes throughout the solar system and beyond. We’ve seen deeply into our universe and looked backward nearly to the beginning of time.”

Armstrong didn’t say the space race of the 1960’s prevented a war between the US and the USSR, but said it was a diversion. “It was intense,” he said. “It did allow both sides to take the high road with the objectives of science and learning and exploration.”

But eventually, the competition became cooperation, and while the current partnership between the US, Russia and 14 other countries who have joined together to create the International Space Station isn’t perfect, it is a platform for continued collaboration between the various entities.

As for how NASA has directly affected the average citizen, there’s a plethora of everyday devices and technologies we take for granted that might not be at our disposal without NASA. There’s a nice list here, and everyone should take a look at NASA’s Spinoff website.

Some say NASA is in a midlife crisis. Some say NASA is out of touch. Some look at NASA and think of what could have been. In a speech at the same gala event where Armstrong spoke, NASA’s own administrator Mike Griffin said, “We’re not, on our 50th anniversary, celebrating the 20th anniversary of the first [human] landing on Mars – and we could have been.”

NASA gets plenty of criticism. Some is deserved; some things are out of the space agency’s control. Some argue NASA needs more funding, some say NASA doesn’t manage the funds they have very well. Nonetheless, current estimates say for every dollar we spend on the space program, the U.S. economy receives about $8 of economic benefit. That’s an excellent rate of return, whether we’re in good economic times or bad.

While not everything about NASA can be measured in monetary terms, NASA is an investment.

Personally, NASA has been in existence my entire life. My sister and I camped out in front of the television set for each moon landing. Even though I was pretty young and didn’t understand everything, I knew the events I was watching unfold were bigger than just two men bouncing around on the Moon’s surface and bigger than the country whose flag was planted in the lunar regolith. This was humanity at its best, and a triumph of the spirit and ingenuity that lies within each of us. But those qualities aren’t only in NASA’s past; they’re here right now, too. I still feel that spirit, ingenuity and excitement when I get to share the latest events of a space mission, or have the opportunity to talk with a NASA engineer who helped with an important mission milestone, or an astronomer who just made an incredible discovery.

“Our highest and most important hope is that the human race will improve its intelligence, its character, and its wisdom,” said Armstrong, as he concluded his speech.

NASA, as well as all the world’s space agencies and organizations, have helped in that effort, and given humanity the opportunity to strive for those qualities.

Happy birthday, NASA, and many more.

Source of quotes for Armstrong and Griffin: New Scientist

Uranus Pictures

Uranus, seen by Voyager 2. Image credit: NASA/JPL

So far, only one spacecraft has ever captured an image of Uranus: NASA’s Voyager 2 spacecraft. So let’s take a look at some pictures of Uranus, some captured by Voyager 2, and others seen from Hubble, and even here on the ground.


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This is the classic image of Uranus, taken by NASA’s Voyager 2 spacecraft during its 1986 flyby of Uranus. During this mission, Voyager 2 came within 81,500 kilometers of the cloudtops of Uranus. Until then, the best pictures of Uranus came from telescopes on Earth. Nothing compared to the pictures of Uranus sent back by Voyager 2.


Uranus seen from Earth. Image credit: Keck
Uranus seen from Earth. Image credit: Keck

This beautiful picture of Uranus might look like it was captured by a space telescope, but it was actually taken from the powerful Keck telescope located on Hawaii’s Mauna Kea. This image shows Uranus in the infrared spectrum, which reveals the detailed cloud patterns in the atmosphere of the planet.


Uranus with its moons and rings. Image credit: Hubble
Uranus with its moons and rings. Image credit: Hubble

This Uranus pic was captured by the Hubble Space Telescope. On the left is the image itself, and then on the right are the names of all the moons captured in this photograph of Uranus.


Crescent Uranus. Image credit: NASA/JPL
Crescent Uranus. Image credit: NASA/JPL

This beautiful image of Uranus was captured by NASA’s Voyager 2 spacecraft curing its 1986 flyby of the planet. It was actually three images captured at different wavelengths and then combined on computer.

Like these pictures of Uranus? Here are some images of Pluto, and photographs of the Sun.

If you’d like more info on Uranus, check out Hubblesite’s News Releases about Uranus. And here’s a link to the NASA’s Solar System Exploration Guide to Uranus.

We have recorded an episode of Astronomy Cast just about Uranus. You can access it here: Episode 62: Uranus.

Mass of Uranus

Uranus Compared to Earth. Image credit: NASA

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The mass of Uranus is 8.68 x 1025 kg.

Want to put that in perspective? That’s 14.536 times more than the mass of Earth. That makes Uranus a pretty massive world, but it’s actually just a tiny fraction of Jupiter. Jupiter is 21.9 times more massive than Uranus.

Even though Uranus is much more massive than Earth, it has a fairly low density. in fact, it’s the second lowest density in the Solar System; only 1.27 g/cm3. If you could stand on the surface of Uranus (you can’t… don’t try), would experience only 89% the force of gravity that you would experience on Earth.

If you could peer inside Uranus, you would discover that most of the planet consists of ices, like water, ammonia and methane.

Here’s an interesting article about the mass of Mercury. And here’s an article about the mass of Jupiter.

If you’d like more info on Uranus, check out Hubblesite’s News Releases about Uranus. And here’s a link to the NASA’s Solar System Exploration Guide to Uranus.

We have recorded an episode of Astronomy Cast just about Uranus. You can access it here: Episode 62: Uranus.

Tilt of Uranus

Uranus. Image credit: Hubble

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The Earth’s axis is tilted about 23.5 degrees. This is why we have seasons on Earth. But the axis of Uranus is tilted so far it’s hard to imagine how it might have even happened. The axis of Uranus is tilted at an angle of 98-degrees compared to the Sun’s orbital plane.

While the rest of the planets in the Solar System can be thought of like spinning tops, Uranus is more like a rolling ball going around the Sun. During the point of the Uranian solstices, one pole faces the Sun continuously, while the other pole faces away. Only a thin strip of the surface of Uranus experiences any kind of night/day cycle. Uranus’ poles experience 42 years of continuous sunlight, and then 42 years of continuous darkness. During the time of the equinox on Uranus, the planet’s equator is facing the Sun, and so it experiences day/night cycles like we have here on Earth.

What could have caused Uranus to be tilted over on its side like this? Astronomers think that a large protoplanet smashed into Uranus billions of years ago. This collision set the planet tumbling. Eventually it settles into its current axial tilt.

Here’s a cool article on Universe Today about mysteries of the Solar System, including the question, why is Uranus tilted? And here’s an article about images of Uranus and Neptune captured by Hubble.

Here’s the same question posed to “ask a scientist”, and here’s an article from the Planetary Society Blog.

We have recorded an episode of Astronomy Cast just about Uranus. You can access it here: Episode 62: Uranus.