Mars has the largest canyon in the solar system, Valles Marineris, stretching 2,500 miles — roughly the width of the US.
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Light from distant galaxies shows us the past.
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The Mars Pathfinder mission tested new landing techniques.
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The light you see from some stars today began traveling before humans existed.
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The universe is estimated to be about 13.8 billion years old.
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There are rogue planets drifting through space with no star at all.
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