Arrokoth, a strange two-lobed space rock, was hit by another rock at some point – the collision may have snapped Arrokoth’s narrow neck before it reformed again
Source:
https://www.newscientist.com/article/2240781-asteroid-arrokoth-may-have-broken-its-neck-in-6400-km-per-hour-impact/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home