The rocky world is located around 4 billion miles from Earth.
On New Year’s Day 2019, NASA’s New Horizons interplanetary probe conducted a flyby of 2014 MU69, otherwise known as"Ultima Thule"—a strange world about 4 billion miles from Earth in the outer reaches of the solar system. It is the most distant object humankind has ever explored.
This early period in the solar system’s development was marked by planet formation. In fact, Ultima is what’s known as a"planetesimal"—small objects made up of rock, dust and other materials that are thought to have coalesced to gradually form planets over time. Several features on the surface of Ultima are described in the new study, including bright spots, hills, troughs, craters and pits. The largest depression the mission team identified—which has been named the"Maryland" crater—measures around 5 miles wide.
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