A solar sail spacecraft uses radiation pressure from sunlight to propel itself without any fuel.
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Mercury is the closest planet to the Sun.
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Neptune is the farthest known major planet from the Sun.
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The International Space Station orbits Earth roughly every 90 minutes.
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Rogue planets drift through space without orbiting a star.
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The Earth's gravity keeps the atmosphere in place.
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The light you see from some stars today began traveling before humans existed.
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The Moon completes its phases in about 29.5 days.
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