The Kepler space telescope found over 2,600 confirmed exoplanets during its 9-year mission.
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Neptune appears blue because of methane in its atmosphere.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The observable universe is about 93 billion light‑years wide.
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The Earth's magnetic north pole moves over time.
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The event horizon marks the boundary around a black hole.
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Neptune is the farthest known major planet from the Sun.
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Mercury has no substantial atmosphere to trap heat.
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The observable universe spans billions of light-years.
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