Not all comets break up as they vent and age, but for Rosetta’s comet 67P, the Rubber Duckie comet, a crack in the neck raises concerns. Some comets may just fizzle and uniformly expel their volatiles throughout their surfaces. They may become like puffballs, shrink some but remain intact. Comet 67P is the other extreme. The expulsion … Continue reading "There’s a Crack Forming on Rosetta’s 67P. Is it Breaking Up?"