How vast is the universe? Unimaginably enormous

Many people, even astronomy enthusiasts, routinely wonder about the frequent reports of UFOs, or UAPs (unidentified anomalous phenomena), frequently spotted in the sky and sending people into fits over alien visitation. But the people who are sincerely worried about that have never taken the first week of an academic course on what astronomers call theContinue reading “How vast is the universe? Unimaginably enormous”
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