2 ms·The geology and geophysics of Kuiper Belt object (486958) Arrokoth41 points by robin_reala 7y agoacvny 7y agoImpressive. How much data can be deducted from some pictures. What is it made of though?Sharlin 7y agoPorous rock and ice, with mean density less than that of water ice. The exact density is apparently unknown because of the objects’s asymmetric shape and a lack of natural satellites.