Giant Asteroids Could Reassemble Hours After Being Nuked: Sorry, Armageddon
by Robert Quigley | 2:36 pm, March 11th, 2010
Today in frightening science news: researchers at UC Santa Cruz and Los Alamos National Laboratory have determined that if a giant asteroid is headed towards Earth, even detonating a small nuclear bomb may not be enough to stop it. The reason? If the blast isn’t powerful enough, the asteroid fragments’ own gravity could pull all of the pieces back together, T-1000-style — in mere hours.
New Scientist reports:
If a sizeable asteroid is found heading towards Earth, one option is to nuke it. But too small a bomb would cause the fragments to fly apart only slowly, allowing them to clump together under their mutual gravity. Simulations now show this can happen in an alarmingly short time.
…
“The high-speed stuff goes away but the low-speed stuff reassembles [in] 2 to 18 hours,” [a researcher] says.
Fortunately, this means that a powerful enough blast could knock the asteroid pieces far enough apart that their gravity doesn’t pull them together, but: better get the maths right before somebody sets up us the bomb.
(via New Scientist)
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Use the nuke to bump it inches off course years before the scheduled impact. Over the course of the subsequent orbits the distance will add up from a near miss to a distant flyby.
Better yet bump them into the Lagrange Points and collect them for robotic extra terrestrial mining and manufacturing.
cluster bombs