An image of the galaxy COSMOS J100043.15+020637.2 taken with the Advanced Camera for Surveys on the Hubble Space Telescope. The tidal tail of stars, gas, and dust shows that this galaxy recently merged with another galaxy, which brought two supermassive black holes into this galaxy. A team of astronomers confirmed that the two bright nuclei near the center of the galaxy correspond to the two black holes, which are waltzing under the effects of gravity towards the galaxy center.