In a key geological moment about 66 million years ago, an enigmatic something killed off almost all the dinosaurs and some 70 percent of all other species living on Earth.
The brightest comet for several years should become visible in the Northern Hemisphere night sky over the next few days.
A recently-discovered comet has a chance - albeit a small one - of hitting Mars in October next year.
Scientists say they're homing in on the precise date of both the extinction of the dinosaurs 66 million years ago, and the massive impact that's believed by many to have caused it.
A group of researchers has poured scorn on the idea that a comet wiped out the North American Clovis people 13,000 years ago.
A newly-discovered comet looks likely to blaze brightly in our skies late next year.
More evidence has emerged that a massive comet hit the Earth about 13,000 years ago, backing up a widely-disputed theory.
Scientists say they've found more evidence of a major impact by a comet or asteroid, some 13,000 years ago.
French director David Cholewa recently released the first proper trailer for his upcoming sci-fi/horror Dead Shadows film.
The first big meteor shower of 2012 is set to kick off early Wednesday morning from about 3-5 a.m.
To the surprise and delight of astronomers, a comet discovered just two weeks ago as it hurtled towards the sun has skimmed the star and re-emerged the other side.
NASA is planning to use a giant crossbow and harpoon to capture samples from a speeding comet.
Astronomers have come up with two competing theories to explain a mysterious cosmic explosion first detected by NASA's Swift observatory on Christmas Day 2010.
Earth's oceans could once have been giant icebergs floating through space, an ESA team has concluded, after examining the isotopic composition of a comet.
Comet Hartley 2 is an excitable little chap - in a class of its own, say astronomers.
The Stardust spacecraft's Valentine's Day flyby of the Tempel 1 comet has delivered pictures of the comet that clearly show the effects of its last encounter with a spacecraft in 2005.
The Stardust NExT probe is preparing for an encounter on St Valentine's Day with comet Tempel 1.
Rather appropriately for the time of year, NASA's EPOXI team says that the mission's recent encounter with comet Hartley 2 observed a flurry of snow streaming out from the comet.
NASA's Deep Impact spacecraft got a closeup view of comet Hartley 2 yesterday, getting within 435 miles of the comet.
The Rosetta spacecraft has captured the first, high-quality pictures of the "Lutetia" asteroid.