Grumpy Old Geeks Topics Supermassive black hole collision Topic Supermassive black hole collision 2 mentions in 1 episode The hosts discuss a video depicting the future collision of two supermassive black holes. Mentions 129: Selfie Selection Sep 25, 2015 42:50 there are two super massive black holes that are going to collide 43:26 about to collide for the scale of the universe