The little green blip that ended a three-year wait

This small green blip in the graphs below was the sign that scientists at the European Space Agency were waiting for to show that the Rosetta spaceship had awoken from its deep slumber:

The small green spike on the monitor was the sign they were waiting for
The small green spike on the monitor was the sign they were waiting for Credit: European Space Agency / J├╝rgen Mai

Read: Rosetta spacecraft comes to life after three-year 'nap'

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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.