A Russian scientist claims to have found three tiny meteorite samples from the 1908 Tunguska event. Did they really originate from the historic fireball? Continue reading →

As it makes its death-defying dive toward the sun, Comet Pan-STARRS is dazzling the inner solar system, saturating the pixels of a solar observatory's digital camera. ->

There were many surprises in store when NASA's recycled Deep Impact spacecraft soared past its second comet earlier this month, but nothing was more unexpected than the weather: It was snowing.

It's still 300,000 miles away, but the jagged features of Vesta, a large asteroid that is believed to be a protoplanet, are starting to come into view of NASA's Dawn spacecraft.

A recycled comet probe that flew NASA's Deep Impact mission has sent back its first picture of its next target, the comet 103P/Hartley, also known as Hartley 2.