In a journal published by the American Astronomical Society, scientists have noticed the supermassive black hole thought to be the center of Abell 2261 may no longer there.
"But if it’s not there, it would be the only such large galaxy yet discovered without such a massive black hole at its center.
“There are all sorts of things you can learn with gravitational waves about supermassive black holes, as a population or individual sources, that you are either really hard or impossible to learn with traditional electromagnetic astronomy,” he added