The Earth's oceans cover more than 70% of the planet's surface.
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Neptune is the farthest known major planet from the Sun.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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Project Mercury was the first U.S. human spaceflight program.
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The Earth's orbit determines the length of the year.
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The Kepler mission searched for Earth-like exoplanets.
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The solar panel converts sunlight into electricity.
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Neutron stars are among the densest objects in the universe.
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Saturn's rings are made primarily of ice particles and rocky debris.
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