The Fermi Paradox asks why, given the vast number of potentially habitable planets, we've detected no signs of other civilizations.
Fact #4569
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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The expansion of the universe was first observed in the 1920s.
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Rogue planets drift through space without orbiting a star.
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The light you see from some stars today began traveling before humans existed.
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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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The Earth's gravity affects the movement of tides.
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The Moon's gravity affects ocean tides.
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