Space starts at the Kármán line, just 100 km above sea level.
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The telescope expanded understanding of the universe.
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The observable universe is about 93 billion light‑years wide.
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Some pulsars emit beams of radiation like cosmic lighthouses.
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Mercury has extreme temperature differences.
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The Sun accounts for more than 99% of the mass of our solar system.
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Some stars explode when they die.
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The Moon's surface is covered in craters.
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