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.
British scientists reckon they've identified the largest comet yet, using data from the ESA/NASA Ulysses spacecraft to measure the region of space disturbed by the its presence.
The Secure World Foundation (SWF) has warned the UN that it may be too disorganised to avoid disaster in the event of a major meteorite strike.