Before the Apollo mission research, there were three theories about how the Moon formed.
The Apollo mission brought back rock and soil from the Moon. It showed that the Earth and Moon share chemical and isotopic similarities, suggesting a linked history.
The giant-impact model suggests that, in the Earth's early history, the proto-Earth and Theia (a Mars-sized planet) collided and reformed as one body. A small part of the new mass spun off to becom...
If you look at the lunar surface, it seems pale grey with dark splodges.
The pale grey is a rock named anorthosite. It forms as molten rock cools down. The dark area...
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I never knew about this quasi-moon. If you are into space and space exploration I highly recommend Jeffrey Kluger's weekly newsletter from Time.com.
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