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Politics, Special Report, Americas
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NASA tested four nuclear scenarios: a surface explosion, a delayed surface explosion, a subsurface explosion and a standoff explosion (where the bomb doesn't come into contact with the asteroid). The surface and subsurface explosions are the most effective, but there's a good chance of splitting the asteroid. In the end, the space agency determined that a series of standoff nuclear explosions would be the most effective way to deflect an asteroid headed for Earth. The best option in the non-nuclear category is a kinetic impact (a nice way of saying they would ram objects into the asteroid), but doing so would require detailed knowledge of what the surface of the asteroid is like. Some other non-nuclear options that NASA considered include using a laser or a giant mirror to focus energy on a spot on the asteroid and "boil off" parts of it, or using a spacecraft to tug the asteroid in a different direction. So, will we ever know in our lifetime if it's possible to deflect an asteroid?




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