The footprints astronauts left on the Moon will likely last for millions of years.
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Some galaxies are trillions of miles wide.
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Supernovae can briefly outshine entire galaxies.
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The observable universe is about 93 billion light‑years wide.
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The Earth's axis is tilted about 23.5 degrees.
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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 rotation slightly bulges at the equator.
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The observable universe spans billions of light-years.
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Mercury is the closest planet to the Sun.
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