Two astronomers may be seeing double. They report evidence that a galaxy about 4 billion light-years from Earth houses not one, but two giant black holes. Moreover, the duo might be separated by only one-third of a light-year — less than 10 percent of the distance between the sun and its nearest star system, Alpha Centauri.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.