The Formation of Ultima Thule - 1 January 2019
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UltimaThule used to be 2 separate objects. It likely formed over time as a rotating cloud of small, icy bodies started to combine. Eventually, 2 larger bodies remained &amp; slowly spiraled closer until they touched, forming the bi-lobed object we see today:
NASA/JHUAPL/SwRI/James Tuttle Keane
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