Impact Cratering Short Course & Field School 2019
Sept 28 - Oct 5, 2019
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Researchers Discover Lull in Mars’ Giant Impact History
Mars experienced a 400-million-year lull in impacts between the formation of Borealis and the younger basins.
The distance to the Moon is measured to a precision of a few centimeters by bouncing laser beams off reflectors placed there by the Apollo astronauts.