The Great Wall of China is not visible from space with the naked eye — this is a common myth.
Fact #4099
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Cosmic microwave background radiation is evidence of the early universe.
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The observable universe is about 93 billion light‑years wide.
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Neptune is the farthest known major planet from the Sun.
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The Milky Way galaxy contains billions of stars.
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There are more stars in the universe than grains of sand on Earth.
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Rogue planets drift through space without orbiting a star.
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A day on Mars is slightly longer than a day on Earth.
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The Moon's gravity influences ocean tides.
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