NASA’s New Horizons Finds Ultima Thule A Puzzler

Credit: Ultima Thule: NASA/JHUAPL/SwRI
HOUSTON—So far, the New Year’s Day close flyby of the distant Kuiper Belt Object, Ultima Thule, by NASA’s New Horizons mission spacecraft has produced no signs of an atmosphere, moons or rings. But that doesn’t mean the snowman-shaped object more than 4 billion mi. from Earth is short on intrigue...

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