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    Mars was once as big as Earth

    Posted by ChevScience on June 10, 2011

    Jupiter may have robbed Mars of mass, new report indicates

    Planetary scientists have long wondered why Mars is only about half the size and one-tenth the mass of Earth. As next-door neighbors in the inner solar system, probably formed about the same time, why isn’t Mars more like Earth and Venus in size and mass? What’s going on???


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