Titan, Saturn's largest moon, has lakes and rivers made of liquid methane and ethane instead of water.
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The Moon slowly moves away from Earth by a few centimeters each year.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Sun makes up 99.8% of solar mass.
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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 Earth's orbit determines the length of the year.
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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 Moon was formed billions of years ago.
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The Earth's gravity keeps the Moon in orbit.
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