The Department of Defense is taking administrative action against former NASA astronaut and current U.S. Senator Mark Kelly over remarks he made in a 90-second video in November.
Nearly every galaxy has a supermassive black hole in its core. Whether the black hole forms first and then the galaxy around it—or the other way around—is still a matter of some debate, but we know the evolution of both are deeply connected. We can use that relationship to study the black holes.

