Comets are born of fire as well as ice, the first results from the US space agency's (Nasa) Stardust mission show.
Comets are born of fire as well as ice, the first results from the US space agency's (Nasa) Stardust mission show.
In January, Stardust's sample-return capsule landed in Utah, carrying over a million tiny comet grains inside.
The first images of a comet particle were revealed last month