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Astronomers Think A Space Rock The Size Of Manhattan Created Pluto’s Weird, Bumpy Plains
Ever since New Horizons zipped past Pluto in July, we’ve marveled over the dwarf planet’s complex terrain. Among the biggest puzzles Pluto presents us with is a vast, crater-free ice field informally known as Sputnik Planum. The leading hypothesis for how this surface came to be? An epically violent collision.