67P SHAPED BY A COLLISION
The latest simulations have shown that 67P/ Churyumov-Gerasimenko, the double-lobed comet visited by the Rosetta mission from 2014-16, could be the result of a high-speed crash. The simulations show that when comets collide, only a small amount of material is vaporised. The rest remains in large enough pieces to clump back together and form a new comet within a few days. High-speed collisions are more common in the current Solar System, so 67P could have conjoined relatively recently.