YouTube · HISTORYThe Universe: MASSIVE Black Holes & Countless Wonders …We used to think that Earth was at the center of the universe, but now we know we’re not even at the center of our own galaxy. See more in….12 hours ago
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YouTube · HISTORYThe Universe: MASSIVE Black Holes & Countless Wonders …We used to think that Earth was at the center of the universe, but now we know we're not even at the center of our own galaxy. See more in….12 hours ago
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