The Voyager 1 probe, launched in 1977, is the farthest human-made object from Earth.
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Some galaxies are trillions of miles wide.
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The Earth's gravity keeps the atmosphere in place.
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The Sun accounts for more than 99% of the mass of our solar system.
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The universe is estimated to be about 13.8 billion years old.
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Black holes can bend time.
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Venus has surface temperatures hot enough to melt lead.
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The observable universe is about 93 billion light‑years wide.
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Mercury has no substantial atmosphere to trap heat.
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