Why are black holes invisible?
Professor Brian Cox explains why black holes are invisible. Black holes are the most destructive forces in the universe, able to devour whole stars. We cannot see them, but we can see the effect they have on the surrounding space. Brian uses Zambia’s spectacular Victoria Falls as an analogy to explain what happens as matter draws closer to a black hole’s event horizon. Space flows faster and faster, as matter approaches, until the point that even light can no longer escape.