How can people be so sure that the earth is expanding? Also, if the Sun has an orbit what keeps it in its orbit?
Filed under: Astronomy Big Questions, Unanswered Big Questions | 1 Comment »
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How can people be so sure that the earth is expanding? Also, if the Sun has an orbit what keeps it in its orbit?
Filed under: Astronomy Big Questions, Unanswered Big Questions | 1 Comment »
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