Following its historic visit to Pluto, New Horizons has spent the past four years heading to a distant place only discovered in 2014: Ultima Thule. On New Year’s Day, it flew past that object and took ...
Ultima Thule is one of the solar system’s most hermitlike homebodies. In the 4.6 billion years since the small icy world formed, astronomers think that it has never moved from its original orbit about ...
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