The footprints left by Apollo astronauts on the Moon may remain there for millions of years because there is no wind to erase them.
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The Sun makes up 99.8% of solar mass.
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Black holes form from collapsed massive stars.
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The Earth completes one full rotation approximately every 24 hours.
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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 light you see from some stars today began traveling before humans existed.
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The Moon has no liquid water on its surface today.
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The Moon completes an orbit around Earth in about 27 days.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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