Neutron stars pack 1.4 times the mass of the Sun into a sphere about 20 km across.
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The observable universe is about 93 billion light‑years wide.
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The International Space Station is one of the most complex engineering projects ever built.
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Venus is sometimes called Earth's sister planet.
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The Milky Way galaxy contains billions of stars.
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The Earth's magnetic poles slowly shift over time.
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Project Mercury was the first U.S. human spaceflight program.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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