text: what would happen if two black hole event horizons approached each other? considering the possible physics that are yet unknown about the mechanics of black holes, how much mass attracting a black hole could even move it? i figure it could only be another black hole, but what would that look like as they approached each other and since the gravitational pull is infinite, how would they swallow up each other's matter? this is a news story about a simulation of just such a collision.