Markarian 739 In visible light, Markarian 739 resembles a smiling face, with a pair of bright cores underscored by an arcing spiral arm. The object is really a pair of merging galaxies. Data from Swift and Chandra reveal the eastern core (left) to be a previously unknown supermassive black hole; past studies already had identified one in the western core. The two supermassive black holes are separated by about 11,000 light-years. The galaxy is 425 million light-years away. NASA/SDSS
from popsci
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