New Horizons on New Year's day came within 2,200 miles (3,500 km) of Ultima Thule, which represents a pristine time capsule dating to the birth of the solar system. The fly-by marked the farthest close encounter of an object within our solar system.
New Horizons on New Year's day came within 2,200 miles (3,500 km) of Ultima Thule, which represents a pristine time capsule dating to the birth of the solar system. The fly-by marked the farthest close encounter of an object within our solar system.
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