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 Earth's magnetic poles slowly shift over time.
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The Moon was formed billions of years ago.
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The light you see from some stars today began traveling before humans existed.
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Neptune appears blue because of methane in its atmosphere.
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The Earth's magnetic field protects against solar radiation.
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The International Space Station orbits Earth every 90 minutes.
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Space is completely silent.
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The Mars Pathfinder mission tested new landing techniques.
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