Scientists cheer as Rosetta transmits its first signal

There was much cheering and back-slapping at the European Space Agency after a three-year bet paid off.

Watch the moment on the video below (from one minute and 30 seconds in):

Read: The little green blip that ended a three-year wait

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Comet-chasing probe sends signal after 'space hibernation'

The European Space Agency's comet-chasing Rosetta probe has sent back a signal after it was woken from its "deep space hibernation" after almost three years.