Vesta, the second-largest object in the asteroid belt, may have a thin skin of water molecules like parts of the moon. Dawn, an orbiting spacecraft, arrives today to begin orbiting and observing.
Atlantis and its four-member crew, in the final mission of the space shuttle program, shrugged off concerns about the weather and took off for one last supply run to the International Space Station.
Atlantis launch: Despite a bleak forecast of thunderstorms and clouds, the shuttle beat the weather in a stunning midday launch, sailing into the sky on one final voyage.
At 9:26 AM Eastern time on Monday, a small asteroid will make an extremely close pass to our planet, but there is no chance that it will strike it, say NASA officials.
Vesta and Ceres, the two largest objects in the asteroid belt, have mystified scientists for centuries. With NASA satellite Dawn on final approach to Vesta, the wait is almost over.
A joint NASA-Pentagon project, called the 100 Year Starship Study, aims to get inventive minds thinking about how human interstellar space travel can become a reality by next century.
Asteroid Vesta has been coming into focus as NASA's Dawn probe comes in for close-up photos, but a mysterious dark spot has scientists scratching their heads.
Worms from Hell? Scientists have discovered a new species of worm called Halicephalobus mephisto in honor of Faust's demon Mephistopheles. It's the deepest living multicell organism found in the Earth.
Beginning of the end of the world: May 21st is what a California minister (with a considerable following) predicts. Scientists, for their part, consider the sun's 'habitable zone' in calculating when Earth will become toast.
In a 40-minute plea at the White House to save the US space shuttle, John Glenn said that relying on the Russians to get US astronauts into space was a mistake. Why did President Obama turn him down?