A Spacecraft Sent to Pluto Reveals a Heart-Shaped World
In 1991, the United States Postal Service released a set of stamps depicting each planet and noting which spacecraft had explored it. Pluto’s stamp featured an artist’s rendition of an uninhabitable planet with no features and the words: “NOT YET EXPLLORED.” New Horizons successfully reached Pluto and discovered that its moons Charon, Nix, Hydra and […]
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