Nasa probe sends back its first video of the moon's 'dark side'

Nasa's twin Grail probes arrived at the moon in early January - and one has just sent back its first video from the 'dark' side of the moon, the one we don't see from Earth. The video shows a flight from the north pole to the south pole of the moon. 'It's very rugged and covered with impact craters from asteroids that hit the moon's surface,' says Maria Zuber, Nasa's principal investigator on Grail.

In the video, the north pole of the Moon is visible at the top of the screen as the spacecraft flies toward the lunar south pole. The side explored in the video can never be seen from Earth. The moon is 'tidally locked' to earth, so one side always faces away from us.

It's the first video from the two probes - named 'Ebb' and 'Flow' - but many more will be sent back as American school pupils join in an interactive project to explore the moon's 'other' side.




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