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    Why Earth is so much bigger than Mars: Rocky Planets formed from ‘Pebbles’

    October 28, 2015, Categories  Astronomy/Space

    Southwest Research Institute scientists developed a new process in planetary formation modeling that explains the size and mass difference between the Earth and Mars. Mars is much smaller and has only 10 percent of the mass of the Earth. Conventional solar system formation models generate good analogs to Earth and Venus, but predict that Mars should be of similar-size, or even larger than Earth. Credit: Image Courtesy of NASA/JPL/MSSS

    Southwest Research Institute scientists developed a new process in planetary formation modeling that explains the size and mass difference between the Earth and Mars. Mars is much smaller and has only 10 percent of the mass of the Earth. Conventional solar system formation models generate good analogs to Earth and Venus, but predict that Mars should be of similar-size, or even larger than Earth. Credit: Image Courtesy of NASA/JPL/MSSS

    Using a new process in planetary formation modeling, where planets grow from tiny bodies called ‘pebbles,’ scientists can explain why Mars is so much smaller than Earth. This same process also explains the rapid formation of the gas giants Jupiter and Saturn, as reported earlier this year.

    “This numerical simulation actually reproduces the structure of the in...

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