Black holes can slow time so much that seconds near them equal years far away.
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Dark matter is believed to make up most of the universe’s mass but has not been directly observed.
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The expansion of the universe was first observed in the 1920s.
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Comets can develop long tails when near the Sun.
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In 1954, a woman in Alabama reported being struck by a meteorite fragment inside her home.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe spans billions of light-years.
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The Apollo 11 mission successfully landed humans on the Moon.
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