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Unformatted text preview: Geology Meteorites are debris left over from the assembly of the sun and the planets-Meteorites have hit the ground-Meteors are still in the sky The sun and planets were assembled about 4.5 billion years ago by the gravitational collapse of a cloud of dust and gases called the solar nebula During the collapse of the solar nebula gravitational attraction assembled dust into solid bodies called planetesimals-planetesimals were often shattered by collisions with each other The asteroid belt between Mars and Jupiter consists of planetesimals that did not assemble into a planet Meteorites are planetesimals that have not yet become part of the sun or planets-Most meteorites are from the asteroid belt-Some are from comets-Some are from debris blasted off of the Moon and Mars by meteorite impacts there Some planetesimals grew large enough to differentiate into layers-This differentiation produced a nickel- iron core and a silicate mantle and crust When these larger planetesimals collided they broke into pieces that consisted on nick-iron fragments,...
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- Fall '08