The low density of Kuiper Belt Object Arrokoth sheds light on the formation of planetesimals in the early solar system.
Arrokoth
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New Horizons Sends First Looks of 2014 MU69
Explore 10 things scientists have already learned about the most distant object visited by a spacecraft from Earth.
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World Without Time
On New Year's Day 2019, a spacecraft known for its historic flyby of Pluto will take an unprecedented look into the distant past by flying right up to a frozen remnant of the original solar system.