#HowTheUniverseWorks | Tuesdays at 10/9c on Science Full Episodes Streaming FREE on Science GO: https://www.sciencechannelgo.com/how-the-universe-works/ Colliding with and devouring other black holes is simply not enough to make black holes supermassive. There's got to be other factors at play. Subscribe to Science Channel: http://bit.ly/SubscribeScience Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT