If an asteroid, even the medium size one approaches earth, nothing much can be done about it except for blowing it up. NASA scientists are now trying to figure out the chances of designing a spacecraft which can be taken to nuke to objects like asteroids in the space.
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While it is possible to divert the near object by slamming into it with so-called impactor, but if time is running out, a nuclear explosion is the best way to prevent it. In a new paper, scientists from NASA and the National Nuclear Security Administration have laid out a plan for the Hypervelocity Asteroid Mitigation Mission for Emergency Response (HAMMER).