We'll likely need to get Perseverance's samples to Earth to determine if they do indeed harbor evidence of Mars life —but the prospects of such a mission are cloudy at best.
Our knowledge of black holes is incomplete. We know there are stellar mass black holes that are created when massive stars collapse on themselves at the end of their lives of fusion. We know that supermassive black holes reside in the hearts of galaxies and sometimes merge with each other. The fact that there are two other hypothetical types of black holes that may or may not exist—primordial black holes and intermediate mass black holes—illustrates how our understanding is lacking.
