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Home Artist concept shows the collision of a large moon-sized planetary body penetrating all the way down to the Earth’s core, with some particles ricocheting back into space. (Southwest Research Institute/Simone Marchi) Artist concept shows the collision of a large moon-sized planetary body penetrating all the way down to the Earth's core, with some particles ricocheting back into space. (Southwest Research Institute/Simone Marchi)

Artist concept shows the collision of a large moon-sized planetary body penetrating all the way down to the Earth’s core, with some particles ricocheting back into space. (Southwest Research Institute/Simone Marchi)

Artist concept shows the collision of a large moon-sized planetary body penetrating all the way down to the Earth's core, with some particles ricocheting back into space. (Southwest Research Institute/Simone Marchi)

Artist concept shows the collision of a large moon-sized planetary body penetrating all the way down to the Earth’s core, with some particles ricocheting back into space. (Southwest Research Institute/Simone Marchi)