2014 MU69 has two nearly-spherical lobes and is a contact binary. The collision between the two lobes happened at a low relative velocity, causing little damage to the resulting object. The "neck" between the lobes contains brighter material which appears to be dust that has settled down the slopes that run towards the point of contact.
[Added BBC link -ed]
(Score: 2) by insanumingenium on Thursday January 03 2019, @12:09AM
I rather applaud timely reporting, it isn't often I read something first on SN.
Given that the first image from the flyby was already on the frontpage, I was eagerly awaiting this nicer photo, I wasn't personally lacking context. Without that context it would have been confusing as hell.