Universe Today

On Nov. 27, planetary scientist Dr. Alan Hildebrand from the University of Calgary and graduate student Ellen Milley brought reporters to a site where they have found numerous meteorite fragments from the bolide that streaked across the sky in Western Canada on Nov. 20. The area where the meteroite fragments were found is called Buzzard Coulee, about 40 kilometers from the town of Lloydminster, on the Alberta-Saskatchewan border. There, around a frozen pond, numerous small rocks and pebbles could be seen that the scientists said were from the meteorite. No large chunks were spotted, however, reporters said.
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Filed under: Meteorites | 32 Comments »

Recent satellite images show new rifts have developed on the Wilkins Ice Shelf which could possibly lead to the opening of the ice bridge that has been preventing the shelf from disintegrating and breaking away from the Antarctic Peninsula. The ice bridge connects the Wilkins Ice Shelf to two islands, Charcot and Latady. As seen in the image above acquired Envisat on November 26, 2008, new rifts (denoted by different colored lines and dates of the events) have formed to the east of Latady Island and appear to be moving in a northerly direction. "These new rifts, which have joined previously existing rifts on the ice shelf (blue dotted line), threaten to break up the chunk of ice located beneath the 21 July date, which would cause the bridge to lose its stabilization and collapse," said Dr. Angelika Humbert from the Institute of Geophysics at Münster University.
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Fragments of the big meteorite that lit up the Canadian skies across the provinces of Alberta and Saskatchewan last week have been found, according to a report in CBC online. University of Calgary scientists said they located several meteorite fragments late Thursday afternoon, and they were planning to take reporters to the site Friday. Planetary scientist Dr. Alan Hildebrand and graduate student Ellen Milley believe thousands of meteorite bits from the 10-ton bolide are strewn over a 20-square-kilometre area. The video above of the fireball was taken by a video camera in a police car in Edmonton, Alberta.
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Greetings, fellow SkyWatchers! Are you ready for a bit of a challenge this weekend? Then break out the big telescope and let's go galaxy hunting in Cetus as we have a look at Hickson Compact Group 16. If you'd like to try something a little easier, then "monkey" around with planetary nebula, NGC 246! Got binoculars or a small scope? Then take on NGC 247 – it's big, bright and beautiful! When ever you're ready, I'll see you out under the stars…. Read more…

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As part of her trip to England, Pamela had a chance to sit down with Oxford astrophysicist Chris Lintott and record an episode of Astronomy Cast. From the first stars to the newest planets, molecules and the chemistry that allows them to form affects all aspects of astronomy. While most astronomers group molecules into three bins of hydrogen, helium and everything else, there are a few who do proper chemistry by studying the sometimes complex molecules that form between the stars.

Click here to download the episode.

Or subscribe to: astronomycast.com/podcast.xml with your podcatching software.

Molecules in Space – Transcript and show notes.

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India's Chandrayaan-1 spacecraft has successfully sent back some of its first science data and images from the moon, but the spacecraft is also experiencing rising temperatures, and mission managers have decided to use the instruments sparingly to avoid overheating. Chandrayaan-1 is currently orbiting over the sunlit side of the moon, and a rise in temperatures inside the spacecraft was expected, but still is a cause for concern. “This rise and fall in temperature inside a satellite is a normal cyclical process," Mylswamy Annadurai, project director of Chandrayaan-I, told a newspaper in India, The Indian Express. "There is nothing unusual about it. But since this is the first cycle being faced by Chandrayaan, we are being extra cautious. We have decided to wait till the temperatures dip to bring the mission into the operational phase.” As of now, all but two of the instruments onboard have been switched on and tested. But only one instrument at a time is being used, and the two inactive instruments won't be turned on until engineers know spacecraft is cool enough.

But scientists released a very nice video from the Terrain Mapping Camera…
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Filed under: Missions, Moon | 12 Comments »

In an effort to bring the space news efforts from the Internet to the radio, I have my own little radio show every Wednesday!

I've been a regular guest on Paranormal Radio with Captain Jack (his awesome show will start immediately after mine, so stay tuned) for a few months now and it looks like they enjoy what I have to say and gave me this two hour slot each week!

I'm really excited about the possibilities this opens up as it is a great way to promote not only articles on the Universe Today and my space science blog Astroengine.com, but the whole space blogosphere. Key to this will be a regular slot for the Carnival of Space where a superb collection space news can be found on the finest space blogs. So, I hope to give the CoS good coverage each week, starting with the 80th week of the Carnival (I'm looking at you Ethan!)…
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Saturn's moon Enceladus may indeed hide an underground reservoir of water. Scientists analyzed the plumes seen spewing from the moon with the Cassini spacecraft, and found water vapor and ice. "There are only three places in the solar system we know or suspect to have liquid water near the surface," said Joshua Colwell Cassini team scientist from the University of Central Florida. "Earth, Jupiter's moon Europa and now Saturn's Enceladus. Water is a basic ingredient for life, and there are certainly implications there. If we find that the tidal heating that we believe causes these geysers is a common planetary systems phenomenon, then it gets really interesting."
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Seemingly, the current space shuttle mission, STS-126, has been all about two things: recycling and restoring. The crew has been working almost nonstop to get a new system that turns urine into drinking water to work correctly; and spacewalkers spent a majority of four grueling EVAs cleaning and lubricating a jammed solar-wing joint on the station's right side. And now there's good news to report on both fronts. The urine recycling system now seems to be working perfectly. "Not to spoil anything, but I think up here the appropriate words are 'Yippee!'" space station commander Mike Fincke told ground controllers. Mission Control replied, "There will be dancing later." The recycling system will be a necessity for supporting the International Space Station's crew, which will increase from three to six in early 2009. Also essential will be enough power to support the larger crew, so having the SARJ working correctly, the Solar Alpha Rotary Joint which allows the solar arrays to track the sun, is more good news. After Endeavour astronauts worked on the giant gears and replaced bearing assemblies, initial tests found the starboard SARJ working well, with no power spikes or excessive vibrations. So, with the major hurdles on the mission being cleared, the astronauts will be able to enjoy an irradiated, freeze-dried, vacuum-packed Thanksgiving holiday meal on Thursday. And UT readers can now enjoy some of the great images from this mission in the gallery below.
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Filed under: Missions, Space Shuttle, Space Station | 9 Comments »

It's Wednesday, so that means its time for another "Where In The Universe" challenge to test your visual knowledge of the cosmos. See if you can name where in the Universe this image is from, and give yourself extra points (or some extra Thanksgiving turkey if you live in the US) if you can name the spacecraft responsible for the image. Make your guess and post a comment if you're brave enough. I'll try to post the answer tomorrow, depending how busy I am with the holiday festivities, so check back sometime Thursday to find the answer and see how you did. Good luck and Happy Thanksgiving!

UPDATE (11/27): The answer has now been posted below. If you haven't made your guess yet, no peeking before you do!!
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Jupiter has a rocky core that is more than twice as large as previously thought, according to computer calculations by a geophysicist who simulated conditions inside the planet on the scale of individual hydrogen and helium atoms. "Our simulations show there is a big rocky object in the center surrounded by an ice layer and hardly any ice elsewhere in the planet," said Burkhard Militzer from University of California, Berkeley. "This is a very different result for the interior structure of Jupiter than other recent models, which predict a relatively small or hardly any core and a mixture of ices throughout the atmosphere." A comparison of this model with the planet's known mass, radius, surface temperature, gravity and equatorial bulge implies that Jupiter's core is an Earth-like rock 14 to 18 times the mass of Earth, or about one-twentieth of Jupiter's total mass, Militzer said. Previous models predicted a much smaller core of only 7 Earth masses, or no core at all.
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The search is on for fragments of a 10-ton rock that lit the sky over western Canada last Thursday evening. Scientists estimate that at the time it hit Earth's atmosphere, the asteroid fragment weighed approximately 10 tons and was probably about the size of a desk. It exploded with the force of 300 tons of dynamite, and hundreds of fragments of the meteorite weighing more than 50 grams (1.76 ounces) are likely strewn over a wide area. The speed of entry was relatively slow, about 14 kilometers (8.7 miles) per second, well below the average 20 kilometers (12.4 miles) per second of most meteorites, said University of Calgary researcher Alan Hildebrand. Amateur astronomers, meteorite hunters and rock hounds have been combing the prairies in western Canada for a 10-ton meteorite that lit the sky and exploded with the force of 300 tons of dynamite, according to experts from the Canadian Space Agency.
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An organic sugar molecule which is directly linked to the origin of life has been detected in a region of our galaxy where habitable planets could exist. Using the IRAM radio telescope in France, an international team of scientists found the molecule in a massive star forming region of space, about 26,000 light years from Earth. “This is an important discovery, as it is the first time glycolaldehyde, a basic sugar, has been detected near a star-forming region where planets that could potentially harbour life may exist,” said Dr. Serena Viti, one of the paper’s authors. Glycolaldehyde can react to form ribose, a key constituent of the nucleic acid RNA, thought to be the central molecule in the origin of life.
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Filed under: Astrobiology | 21 Comments »

It is rare you'll see such a high-ranking ex-NASA official being so blunt with his criticism of the US space agency. Alan Stern resigned as associate administrator on April 11th this year under a cloud of controversy after it was reported the Mars Exploration Rover budget would be cut; with an emphasis on switching Spirit off for an extended period. Soon after, NASA appeared to do a U-turn and said they had no such plans to scale back rover operations. However, it would seem, Stern was caught right in the middle, but NASA would not comment as to whether Stern's resignation was in connection to the cut-back announcement. Stern said the short-sighted attitude of NASA officials concerning budget overruns, plus the fact he was stopped from doing anything about it, precipitated his resignation. It looks like the Spirit debacle was a symptom of a much deeper illness (or "a cancer" as Stern calls it).

So, eight months after stepping down from his post as associate administrator (second only to NASA Administrator Michael Griffin) Alan Stern has written a highly critical article in the New York Times, firing a salvo across the bows of the US space exploration strategy…
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Ever since Hanny Van Arkel found an unusual object while scanning through images as an enthusiastic Galaxy Zoo volunteer, astronomers and astronomy enthusiasts have wondered what the bizarre object, known as "Hanny's Voorwerp" actually is. Now, new observations made by radio telescopes may have finally revealed the nature of the Voorwerp (Dutch for "object.") It appears as though a jet of highly energetic particles is being generated by a massive black hole at the center of IC2497, creating an ionized gas cloud.
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Filed under: Astronomy, Black Holes | 9 Comments »