The Andromeda Galaxy is on a collision course with the Milky Way and will merge in about 4.5 billion years.
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The Moon's surface is covered in craters.
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Solar eclipses occur when the Moon blocks the Sun from Earth's view.
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The observable universe is about 93 billion light‑years wide.
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Saturn has dozens of known moons.
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Some stars collapse into black holes at the end of their life cycle.
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The observable universe spans billions of light-years.
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The light you see from some stars today began traveling before humans existed.
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The Earth is not perfectly round.
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