Not black holeBut black holes are inside the Universe. :O
Steven Universe starts off slow, but it's soooo worth it. Some of the best character development I've ever seen in a show. And I hated the first episode too, but I enjoyed nearly every single other one more. If you really want, you can skip episodes 5, 6, 9, 13, 18, and maybe a few others, but pretty much all of the others have at least something that you need to understand later episodes. It has a very heavy canon.