On Mercury, a year lasts only 88 Earth days, but a day lasts 59 Earth days.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The event horizon marks the boundary around a black hole.
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Cosmic microwave background radiation is evidence of the early universe.
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The light you see from some stars today began traveling before humans existed.
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Time moves slower in stronger gravitational fields.
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Time moves slower in stronger gravitational fields.
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Saturn's rings are made primarily of ice particles and rocky debris.
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Neptune appears blue because of methane in its atmosphere.
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