The idea that there may be a stellar twin patrolling the outermost regions of the solar system, scattering Oort Cloud objects, may be the result of statistical error.
The inside of the moon may have as much water as Earth's mantle, finds an analysis of moon crystals returned by Apollo astronauts.
Residents of Atlanta, Ga., were treated to a rare event on Friday night: a 2-meter wide chunk of cometary material entered the atmosphere right above their heads.
Sometimes, Earth just needs to take one for the team. But how can we mitigate the worst an asteroid impact can inflict?
Has deep space deep-frozen the interplanetary vagabond?
Main-belt asteroid 596 Scheila was hit by a much smaller, unknown asteroid late last year and the Swift and Hubble telescopes were there to see the aftermath.
How did Earth manage to hold onto its organics after being slammed by a Mars-sized object 4.4 billion years ago?
A dizzying array of doomsday predictions have been linked to the Earth-bound comet Elenin.
We humans are notoriously bad at preparing for the worst. But what if "the worst" comes in the form of a billion-ton-speeding-bullet from outer space? Yeah right, that'll never happen...
Mission success! Stardust-NExT completes comet Tempel 1 flyby.