A quasar can emit more energy than an entire galaxy containing billions of stars.
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Comets orbit the Sun in elongated paths.
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The light you see from some stars today began traveling before humans existed.
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The Earth's magnetic north pole moves over time.
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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 Kepler mission searched for Earth-like exoplanets.
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The observable universe is about 93 billion light‑years wide.
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The Milky Way is estimated to contain hundreds of billions of stars.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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