Rosetta probe catches comet after 10-year chase
6 August 2014 Last updated at 21:21 BST
Europe's Rosetta spacecraft has made a rendezvous with a comet - after a 10-year chase.
The spacecraft went into orbit around the comet while it was hurtling through space, marking a landmark moment in space history.
It is hoped the mission could reveal more about the emergence of life on Earth.
David Shukman reports.