Cosmic inflation theory suggests the universe expanded faster than light in the first fraction of a second after the Big Bang.
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There are rogue planets drifting through space with no star at all.
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The Fermi Paradox questions why extraterrestrial life has not been observed.
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Project Mercury was the first U.S. human spaceflight program.
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The Earth's gravity keeps the atmosphere in place.
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The Earth's gravity keeps the Moon in orbit.
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The Moon completes an orbit around Earth in about 27 days.
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The Moon completes its phases in about 29.5 days.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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