1. Why is 250 million years called a cosmic year?
A: That's the amount of time it takes the solar system to revolve around the Milky way core.
B: That's the amount of time it takes the solar system to rotate on its axis.
C: That's the amount of time it takes the Milky Way to rotate on its axis.
D: That's the amount of time it takes the Milky Way to revolve around the Universe core.
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1. Why is 250 million years called a cosmic year?
A: That's the amount of time it takes the solar s...
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