White dwarfs are about the size of Earth but pack the mass of the Sun.
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The Milky Way galaxy is part of the Local Group.
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Dark energy is thought to drive the accelerating expansion of the universe.
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Light from distant galaxies shows us the past.
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The light you see from some stars today began traveling before humans existed.
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The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
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Venus is sometimes called Earth's sister planet.
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The observable universe spans billions of light-years.
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