An artist’s impression of NASA’s New Horizons spacecraft encountering Ultima Thule, a Kuiper Belt object that orbits 1 billion miles (1.6 billion kilometers) beyond Pluto, on Jan. 1, 2019.
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An artist’s impression of NASA’s New Horizons spacecraft encountering Ultima Thule, a Kuiper Belt object that orbits 1 billion miles (1.6 billion kilometers) beyond Pluto, on Jan. 1, 2019.