TR: Small Asteroids Are Held Together by Van Der Waals Force

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bystander
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TR: Small Asteroids Are Held Together by Van Der Waals Force

Post by bystander » Tue Feb 16, 2010 3:01 pm

Small Asteroids Are Held Together by Van Der Waals Forces
Technology Review: arXiv Blog - 2010 Feb 16
Small spinning asteroids are piles of rubble and dust that ought to fly apart but don't. Now astronomers have worked out why not
Scaling Forces To Asteroid Surfaces: The Role Of Cohesion

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geckzilla
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Re: TR: Small Asteroids Are Held Together by Van Der Waals F

Post by geckzilla » Tue Feb 16, 2010 10:20 pm

So the same force that allows gecko toes to stick to smooth glass also holds asteroids together.
Just call me "geck" because "zilla" is like a last name.

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neufer
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Re: TR: Small Asteroids Are Held Together by Van Der Waals F

Post by neufer » Tue Feb 16, 2010 10:44 pm

geckzilla wrote:So the same force that allows gecko toes to stick to smooth glass also holds asteroids together.
You come down offa der Waals right now, geckzilla :!:
Art Neuendorffer

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bystander
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UT: Small Asteroids, Bread Flour, and a 150-Year Old Theory

Post by bystander » Sun Feb 28, 2010 4:32 am

Small Asteroids, Bread Flour, and a Dutch Physicist's 150-Year Old Theory
Universe Today - 2010 Feb 27
Images sent back from space missions suggest that smaller asteroids are not pristine chunks of rock, but are instead covered in rubble that ranges in size from meter-sized boulders to flour-like dust. Indeed some asteroids appear to be up to 50% empty space, suggesting that they could be collections of rubble with no solid core.

But how do these asteroids form and evolve? And if we ever have to deflect one, to avoid the fate of the dinosaurs, how to do so without breaking it up, and making the danger far greater?