Scientists to nudge asteroid off course to protect the Earth

Scientists are to send two spacecraft to knock an asteroid off course, as part of a practice for what they would do if a rock was threatening the future of humanity. The joint US-European Aida (Asteroid Deflection & Assessment) mission will send a small spacecraft to crash into the egg-shaped rock, known as Didymoon. That asteroid doesn’t pose any threat to us — and is far too small to do so — but the mission will be important test for...
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