On Mercury, a year lasts only 88 Earth days, but a day lasts 59 Earth days.
Fact #3547
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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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The observable universe is about 93 billion light‑years wide.
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Neutron stars can spin hundreds of times per second.
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There are black holes at galaxy centers.
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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 Earth's magnetic field shields the planet from solar wind.
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The Moon always shows the same face to Earth.
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