Illustration showing Nasa's Messenger probe in orbit around Mercury
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Nasa's Messenger probe 'had to crash-land'

Nasa's Messenger mission to Mercury has reached its explosive conclusion, after 10 years in space and four in orbit.

The Messenger probe crash-landed on the surface of Mercury at 12-times the speed of sound - and it was no accident.

Larry Nittler the deputy principal investigator on the mission - whose job it is to sift through all the data sent by the probe - told the BBC's Katty Kay why the probe had to crash-land and what Messenger had taught scientists about Mercury.

  • 01 May 2015
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