The European Space Agency aims to make the Rosetta space mission the first to attempt a landing on a comet's surface.
This video reveals what will happen when the Philae lander arrives at the comet with the Rosetta spacecraft:
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Virgin Space Ship Unity is undergoing the final checks in preparation for the long-awaited test flight from the Mojave desert today.
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What Theresa May is attempting is no longer Mission Impossible, even if it remains Mission Improbable.