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    Why a billion years ago did so many more large space objects hit the earth than compared with today?

    Question #107475. Asked by star_gazer. (Jul 28 09 11:26 AM)


    star_gazer

    		Billions of years ago, impacts were far more common. Our moon retains a record of the pummeling it and Earth took: the moon's craters remain, while on Earth, most scars of ancient impacts have been folded back into the planet or weathered away.

    Today's solar system is far less crowded, and in fact Jupiter, having more mass and gravity, scoops up a lot of the dangerous objects, as does the sun.

    http://www.msnbc.msn.com/id/32189337/ns/technology_and_science-space/


    Jul 28 09, 7:06 PM

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