Galaxy mergers are common — the Milky Way has already absorbed dozens of smaller galaxies.
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The Earth orbits the Sun at about 30 kilometers per second.
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The light you see from some stars today began traveling before humans existed.
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The Earth's gravity keeps the Moon in orbit.
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The light you see from some stars today began traveling before humans existed.
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Mercury has no substantial atmosphere to trap heat.
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Exoplanets have been discovered in habitable zones around distant stars.
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The Milky Way is estimated to be over 100,000 light-years wide.
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The light you see from some stars today began traveling before humans existed.
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