The first living creatures to orbit the Moon and return safely were two Russian tortoises aboard Zond 5 in 1968.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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The observable universe is about 93 billion light‑years wide.
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The light you see from some stars today began traveling before humans existed.
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There are black holes at galaxy centers.
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The observable universe is about 93 billion light‑years wide.
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The Moon completes its phases in about 29.5 days.
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The Milky Way is estimated to be over 100,000 light-years wide.
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Neptune is the farthest known major planet from the Sun.
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