Stars that are one-third to eight times the mass of the Sun (including the Sun) eventually evolve into red giants. (The Sun is thought to be a red giant in 5 billion years) As it expands a lot in this...
This image was taken in 1969 by Michael Collins, commander of Apollo 11, the mothership of man's first lunar mission. As he orbited the Moon, he reached the exact opposite of the Sea of tranquility, with his nearest humans, Armstrong...
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