Quasars are so bright they can outshine their host galaxies by 1,000 times.
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Neutron stars are among the densest objects in the universe.
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The Earth's gravity keeps the atmosphere in place.
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There are planets made of diamond.
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Quasars are extremely bright objects powered by supermassive black holes.
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The observable universe is about 93 billion light‑years wide.
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The observable universe spans billions of light-years.
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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 has no breathable atmosphere.
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