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Astronomy news

Dark matter 'proof' called into doubt

When Douglas Clowe of the University of Arizona in Tucson announced on 21 August that his team had "direct proof of dark matter's existence", it seemed the issue had been settled. Now proponents of the so-called modified theories of gravity, who explain the motion of stars and galaxies without resorting to dark matter, have hit back and are suggesting that Clowe's team has jumped the gun.
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Planet Or Failed Star?

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Astronomy news // 06 September, 2006 04:09:05
 Astronomers using NASA's Hubble Space Telescope have photographed one of the smallest objects ever seen around a normal star beyond our Sun. Weighing in at 12 times the mass of Jupiter, the object is small enough to be a planet. The conundrum is that it's also large enough to be a brown dwarf, a failed star.

Big Bang's Afterglow Fails Intergalactic 'Shadow' Test

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Astronomy news // 04 September, 2006 05:09:43
 The apparent absence of shadows where shadows were expected to be is raising new questions about the faint glow of microwave radiation once hailed as proof that the universe was created by a "Big Bang."

The Eternal Life of Stardust

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Astronomy news // 03 September, 2006 08:09:45
 A new image from NASA's Spitzer Space Telescope is helping astronomers understand how stardust is recycled in galaxies.

Hubble Captures a Rare Eclipse on Uranus

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Astronomy news // 30 August, 2006 05:08:59
 This NASA Hubble Space Telescope image is a never-before-seen astronomical alignment of a moon traversing the face of Uranus, and its accompanying shadow.

Rare high-altitude clouds found on Mars

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Astronomy news // 27 August, 2006 06:08:28
 Planetary scientists have discovered the highest clouds above any planetary surface. They found them above Mars using the SPICAM instrument on board ESA's Mars Express spacecraft. The results are a new piece in the puzzle of how the Martian atmosphere works.

International Astronomical Union 2006 General Assembly

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Astronomy news // 23 August, 2006 05:08:17
 It is official: The 26th General Assembly for the International Astronomical Union was an astounding success! More than 2500 astronomers participated in six Symposia, 17 Joint Discussions, seven Special Sessions and four Special Sessions.

Stars Too Old to be Trusted?

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Astronomy news // 22 August, 2006 07:08:00
 Analysing a set of stars in a globular cluster with ESO's Very Large Telescope, astronomers may have found the solution to a critical cosmological and stellar riddle. Until now, an embarrassing question was why the abundance of lithium produced in the Big Bang is a factor 2 to 3 times higher than the value measured in the atmospheres of old stars. The answer, the researchers say, lies in the fact that the abundances of elements measured in a star's atmosphere decrease with time.

Backward Sunspot

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Astronomy news // 21 August, 2006 06:08:06
 On July 31st, a tiny sunspot was born. It popped up from the sun's interior, floated around a bit, and vanished again in a few hours. On the sun this sort of thing happens all the time and, ordinarily, it wouldn't be worth mentioning. But this sunspot was special: It was backward.

Direct proof of dark matter published

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Astronomy news // 20 August, 2006 12:08:44
 Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.

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