India, Oct. 10 -- Astronomers have for the first time spotted two black holes two black holes circling each other locked in a cosmic dance.
Black holes are usually invisible, but their surroundings glow brightly as matter falls in. Astronomers have previously imaged just two of them directly: the supermassive black holes in the galaxy Messier 87 and in the heart of our Milky Way, Sagittarius A*. Both revealed a shadowy silhouette surrounded by a ring of light.
Using an extraordinary network of telescopes-including one orbiting halfway to the Moon Mauri Valtonen and associates (including Alok C. Gupta, Shubham Kishore from Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital; and A. Gopakumar from TIFR, Mumbai) found s...