While it may be technically possible, saving Earth from a 'planet killer' asteroid or comet would require very quick action by world leaders.
at a blistering 15,000 mph in September, disintegrating on impact as it gouges out a fresh crater and, in the process, slows the moonlet by a minuscule fraction of an inch per second.The test will not move the targeted asteroid off its trajectory any appreciable amount. But it will allow scientists to assess their ability to one day deflect a threatening body by nudging it off course to ensure it misses Earth entirely.
Lubin favors a more"layered defense," one that includes deflection where appropriate, but also has the ability to break up a threatening space rock.
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