Saturn's moon Titan has rivers and lakes — but they're filled with liquid methane, not water.
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In 1977, a mysterious signal known as the 'Wow! signal' was detected from space.
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The Earth's gravity affects the movement of tides.
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Neutron stars are among the densest objects in the universe.
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The universe has no center.
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Some galaxies are trillions of miles wide.
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Saturn's rings are made primarily of ice particles and rocky debris.
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Mercury is the closest planet to the Sun.
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Mercury has extreme temperature differences.
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