The expansion of the universe was first observed in the 1920s.
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There are rogue planets drifting through space with no star at all.
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A day on Venus is longer than its year.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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Black holes can slow time so much that seconds near them equal years far away.
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Project Mercury was the first U.S. human spaceflight program.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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The Earth's orbit determines the length of the year.
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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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