The Crab Nebula is the remnant of a supernova explosion that was visible from Earth in 1054 AD.
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Venus has the longest day of any planet in the solar system.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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Cosmic microwave background radiation is evidence of the early universe.
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Neptune appears blue because of methane in its atmosphere.
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Saturn could float in water because its density is low.
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The Earth's gravity keeps the atmosphere in place.
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Saturn's rings are made primarily of ice particles and rocky debris.
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The Milky Way is estimated to contain hundreds of billions of stars.
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