Humans haven’t been back to the lunar surface since the Apollo moon program ended over five decade ago. The reasons why go ...
NASA asked James W. Head III to work with the 18 astronauts selected for the first manned mission to orbit the moon since the end of the Apollo program.
The leading explanation for the moon's formation is that a Mars-sized object, called Theia, collided with Earth early in its history. Debris from that collision eventually coalesced to form the moon.
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