What will Rosetta spacecraft do?
Scientists are poised for a key moment in the history of space exploration when a spacecraft attempts to rendezvous with a comet on Wednesday.
Rosetta was launched 10 years ago, and is now edging closer to a comet known as 67P.
It will then attempt something unprecedented - going into orbit around the comet as it hurtles through space at 34,000 mph (55,000 km/h).
Science Editor David Shukman explains what Rosetta's mission will entail and what scientists hope it will discover.
05 Aug 2014
- From the section Science & Environment