There are so many things we cannot understand: take time travel fpr one. In some ways it is possible – objects moving rapidly in space are in a different time relation to slower ones. So while we cannot go back in time, it is imagineable that those who have travelled away at high speeds, not even approaching light speeds – that if they return, we would all have passed away!
TIme really is a variable. That is something weird isn’t it? And then as for black holes and all the rest of it, well wow. Light cannot go inside, but there is an event horizon – check out that film, for a fun encounter with the devil and the beyond of now!