Roughly 4% of the universe is made of ordinary matter — the rest is dark matter and dark energy.
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The Moon's surface is covered in craters.
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The Moon's gravity affects ocean tides.
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The Earth's magnetic field protects against solar radiation.
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The Milky Way is estimated to be over 100,000 light-years wide.
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The Milky Way is estimated to contain hundreds of billions of stars.
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Saturn has dozens of known moons.
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