c The number of craters per unit area in the relatively smooth 'mare' regions of the Moon, which trace the impact history over the past ~ 3 Gyr, indicate a total of about 10 impacts, leaving 50 km radius craters, during this period. Based on the assumptions in b), these would be impacts of objects with radii > 4 km. From geometrical considerations alone (i.e., the relative target sizes posed by the Earth and by the Moon, and ignoring gravity), estimate how many such objects have struck the Earth.
c The number of craters per unit area in the relatively smooth 'mare' regions of the Moon, which trace the impact history over the past ~ 3 Gyr, indicate a total of about 10 impacts, leaving 50 km radius craters, during this period. Based on the assumptions in b), these would be impacts of objects with radii > 4 km. From geometrical considerations alone (i.e., the relative target sizes posed by the Earth and by the Moon, and ignoring gravity), estimate how many such objects have struck the Earth.
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Transcribed Image Text:c The number of craters per unit area in the relatively smooth 'mare' regions of the Moon, which
trace the impact history over the past - 3 Gyr, indicate a total of about 10 impacts, leaving 50
km radius craters, during this period. Based on the assumptions in b), these would be impacts
of objects with radii > 4 km. From geometrical considerations alone (i.e., the relative target
sizes posed by the Earth and by the Moon, and ignoring gravity), estimate how many such
objects have struck the Earth.
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