About a billion miles more distant than Pluto is Ultima Thule, a peanut-shaped object in the outer solar system that’s the farthest place ever visited by humans.
Ultima Thule is what’s called a contact binary object, consisting of two lobes that formed separately through an accumulation of small particles of gas and dust. Only later did they fuse together, scientists believe.
Collisions in Ultima Thule’s section of the Kuiper Belt typically occur at the speed of a bullet, but Ultima Thule doesn’t display the scars that would have resulted from such a violent merger. If there had been a moon, it would have helped scientists determine the density of Ultima Thule. Instead, all the study authors could say is that it’s most likely to resemble the nuclei of comets.Both lobes have pits, but the team identified only two possible impact craters, in a depressed region on Thule called Maryland.
of the light that strikes its surface. For the sake of comparison, potting soil reflects about 10% of its light, Stern said.
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