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Wanted: man to land on killer asteroid and gently nudge it from path to Earth
Nasa evokes Hollywood in effort to avoid catastrophe
It is the stuff of nightmares and, until now, Hollywood thrillers. A huge asteroid is on a catastrophic collision course with Earth and mankind is poised to go the way of the dinosaurs.
To save the day, Nasa now plans to go where only Bruce Willis has gone before. The US space agency is drawing up plans to land an astronaut on an asteroid hurtling through space at more than 30,000 mph. It wants to know whether humans could master techniques needed to deflect such a doomsday object when it is eventually identified. The proposals are at an early stage, and a spacecraft needed just to send an astronaut that far into space exists only on the drawing board, but they are deadly serious. A smallish asteroid called Apophis has already been identified as a possible threat to Earth in 2036.
A 1bn tonne asteroid just 1km across striking the Earth at a 45 degree angle could generate the equivalent of a 50,000 megatonne thermonuclear explosion. Attempting to break it up with an atomic warhead might only generate thousands of smaller objects on a similar course, which could have time to reform. Scientists agree the best approach, given enough warning, would be to gently nudge the object into a safer orbit.
Originally posted by wiseones
The thing is, the probability for a tiny object like an asteroid...
Sure, an asteroid could get sucked into the pull of earth's gravity...but it would probably orbit for a while before slingshotting away. Even if "Aphophis" gets anywhere near earth, it would still have to get close enough, and be traveling at an exact intercept path with earth to even stand a chance of hitting us.