We refer to our own solar system as the solar system, and in a sense, it is the only one of its kind. For centuries, our sun was known as Sol, latin for sun and the Roman equivalent of the Greek sun ...
The Milky Way and Andromeda galaxies are predicted to collide and merge between 3.9 and 5.6 billion years from now, based on observed relative motion. The merger process will involve multiple ...
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