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    ‘gravitational cross section’ of the planet tagged posts

    Rare Metals on Mars and Earth implicate Colossal Impacts

    March 19, 2018, Categories  Astronomy/Space

    The surface features of the northern and southern hemispheres of Mars are very different. In this topographic map, the northern hemisphere (shown in blue) is mostly smooth lowlands and has experienced extensive volcanism. The southern hemisphere (in orange) has an older, cratered highland surface. This dichotomy could have been caused by a giant impact. Credit: University of Arizona/LPL/SwRI

    The surface features of the northern and southern hemispheres of Mars are very different. In this topographic map, the northern hemisphere (shown in blue) is mostly smooth lowlands and has experienced extensive volcanism. The southern hemisphere (in orange) has an older, cratered highland surface. This dichotomy could have been caused by a giant impact. Credit: University of Arizona/LPL/SwRI

    New research has revealed that a giant impact on Mars more than 4 billion years ago would explain the unusual amount of “iron loving” elements in the Red Planet. Planets form as small dust grains stick together and agglomerate with other grains, leading to bigger bodies termed “planetesimals...

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