The expansion of the universe was first observed in the 1920s.
Fact #1606
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There are stars older than the Milky Way.
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Rogue planets drift through space without orbiting a star.
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Gravitational waves were detected a century after Einstein predicted them.
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A day on Venus is longer than its year.
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There are more stars in the universe than grains of sand on Earth.
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The Moon's gravity affects ocean tides.
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Some metals such as mercury are liquid at room temperature.
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Some exoplanets orbit two stars at once.
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