Scientists are still hunting for the source of the faint, persistent hum of gravitational waves discovered reverberating through the Milky Way last year. Those waves could point to more than one tantalizing source, new research suggests.
The discovery team, the North American Nanohertz Observatory for Gravitational Waves, or NANOGrav, collaboration, strongly suspects the ripples in space-time were created from merging supermassive black holes, each a billion times more massive than our sun. These are known as binary pairs. If that's indeed the case, ongoing work would help estimate the locations of the celestial cosmic beasts, as well as their masses.
