The event horizon of a black hole is the boundary beyond which nothing, not even light, can escape.
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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 observable universe is about 93 billion light‑years wide.
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The universe is estimated to be about 13.8 billion years old.
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The Moon slowly moves away from Earth by a few centimeters each year.
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There are rogue planets drifting through space with no star at all.
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The Moon has no liquid water on its surface today.
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The Earth's rotation speed varies slightly over time.
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The observable universe spans billions of light-years.
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