When Pluto was first visited by a spacecraft in 2015, scientists discovered a massive, heart-shaped glacier on its surface. This bright expanse, dubbed "Tombaugh Regio," is composed of nitrogen ice and constantly refreshes itself with new ice from Pluto's atmosphere. Its youthful gleam puzzles experts, hinting at heat-generating processes beneath the icy crust—an unexpected warmth in the cold, outer reaches.
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