There are stars in the night sky whose light began traveling toward Earth before humans evolved.
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The observable universe is about 93 billion light‑years wide.
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The Mars Pathfinder mission tested new landing techniques.
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The Earth's magnetic field shields the planet from solar wind.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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The light you see from some stars today began traveling before humans existed.
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Cosmic microwave background radiation is evidence of the early universe.
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Black holes form from collapsed massive stars.
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The universe has no center.
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