The European Space Agency has announced the Rosetta spacecraft has successfully crash-landed onto the comet it has orbited and probed for two years. That ends the probe's 12-year mission to investigate the birth of the Solar System. 

Rosetta had been programmed for a "controlled impact" on comet 67-P, at a human walking pace of about 90 centimeters per second, after a 14-hour freefall from an altitude of 19 kilometers.

Rosetta and the lander probe Philae travelled more than six billion kilometres over 10 years to reach the comet in August 2014.