Stars stop forming when big galaxies collide , 2 hours ago
Astronomers studying new images of a nearby galaxy cluster have found evidence that high-speed collisions between large elliptical galaxies may prevent new stars from forming, according to a paper to be published in a November 2008 issue of The Astrophysical Journal Letters.
| Extinction by asteroid a rarity: 'Sick Earth' extinctions more likely , 2 hours ago
In geology as in cancer research, the silver bullet theory always gets the headlines and nearly always turns out to be wrong.
| 2008 ozone hole larger than last year , 2 hours ago
The 2008 ozone hole – a thinning in the ozone layer over Antarctica – is larger both in size and ozone loss than 2007 but is not as large as 2006.
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Deadlines set for designating polar bear habitat , 9 hours ago
(AP) -- The federal government will designate "critical habitat" for polar bears off Alaska's coast, a decision that could add restrictions to future offshore petroleum exploration or drilling.
| Small asteroid headed for light show over Africa , 9 hours ago
(AP) -- A small asteroid was headed for a fiery but harmless dive into Earth's atmosphere early Tuesday morning over Africa, astronomers said in a first of its kind advance warning.
| Cassini flyby of Saturn moon offers insight into solar system history , 10 hours ago
NASA's Cassini spacecraft is scheduled to fly within 16 miles of Saturn's moon Enceladus on Oct. 9 and measure molecules in its space environment that could give insight into the history of the solar system.
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NASA study finds rising Arctic storm activity sways sea ice, climate , Oct 06
A new NASA study shows that the rising frequency and intensity of arctic storms over the last half century, attributed to progressively warmer waters, directly provoked acceleration of the rate of arctic sea ice drift, long considered by scientists as a bellwether of climate change.
| Lichens function as indicators of nitrogen pollution in forests , Oct 06
Scientists have found lichens can give insight into nitrogen air pollution effects on Sierra Nevada and San Bernardino mountain ecosystems, and protecting them provides safeguards for less sensitive species.
| NASA spacecraft ready to explore outer solar system , Oct 06
The first NASA spacecraft to image and map the dynamic interactions taking place where the hot solar wind slams into the cold expanse of space is ready for launch Oct. 19. The two-year mission will begin from the Kwajalein Atoll, a part of the Marshall Islands in the Pacific Ocean.
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