In 2015, a NASA spacecraft snapped spectacular photographs of Pluto, forever changing humanity's view of that world. On Tuesday that same probe, New Horizons, will provide a closeup of the farthest object ever visited.
New Horizons will speed past an object nicknamed Ultima Thule at 31,500 miles per hour and pass within 2,200 miles of the surface, seeking clues to the earliest days of the solar system. Ultima Thule is four billion miles from the sun, in an area where many astronomers within recent memory believed there wouldn't be much that was worthy of study.
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