Neptune appears blue because of methane in its atmosphere.
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The observable universe is about 93 billion light‑years wide.
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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 Moon's gravity affects ocean tides.
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There are black holes at galaxy centers.
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The Apollo 11 mission successfully landed humans on the Moon.
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The Earth's rotation is gradually slowing over time.
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Cosmic microwave background radiation is evidence of the early universe.
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The James Webb Space Telescope observes distant galaxies in infrared light.
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