How a huge impact may have given the Moon two faces

After running 360 simulations, the team pinpointed the scenarios that came closest to the real-life structure of the Moon. The best fit was that an object about 480 mi (780 km) wide smashed into the near side of the Moon at 14,000 mph (22,500 km/h). Or, a slightly-smaller object – measuring 450 mi (720 km) wide – could have had a similar effect if it was moving a little faster, say 15,000 mph (24,500 km/h).

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