Skip to comments.Iron meteorites may be solar system boomerangs
Posted on 02/17/2006 9:06:57 AM PST by SunkenCiv
Iron meteorites thought to have originated in the asteroid belt beyond Mars may actually have formed near Earth, a new study reports... Iron meteorites are made up of iron and nickel alloys and comprise about 6% of all catalogued space rocks on Earth... Studies show that the known iron meteorites come from about 80 different parent asteroids, while the thousands of known stony meteorites broke off from just 40 or so parent bodies. That suggests astronomers should see many "differentiated" asteroids in the asteroid belt today, says William Bottke of the Southwest Research Institute in Boulder, Colorado, US. But observations have turned up few basalt-covered asteroids, and asteroid "families" fragments of larger parent bodies that broke up after a collision show no signs of differentiation, says Bottke. "The asteroid belt seems to be telling us something very different than the meteorite record," Bottke told New Scientist. "It raises a lot of curious problems." ... "If you expect melting to happen anywhere, it's going to take place closer to the Sun than farther away," says Bottke. Bottke and his colleagues ran computer models of small bodies forming near the Sun and discovered that interactions with the rocky inner planets could have caused these bodies to break up. The interactions also caused a small fraction of them about 1% of those that formed near Earth, and about 10% of those born near Mars to be scattered outward into the asteroid belt... The scenario may explain why so few objects in the asteroid belt appear differentiated, and why recent studies of iron meteorites show they are 1 million to 2 million years older than stony meteorites, Bottke says.
(Excerpt) Read more at newscientistspace.com ...
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Isn't it obvious? You are witnessing sand evolving into rocks.
How stupid am I? I never gave that a thought, I mean, It's so OBVIOUS!
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