You’d think it would be hard to overlook an object with a mass four million times greater than the sun. But when that object is a supermassive black hole like Sagittarius A*, the giant object astronomers have long believed sits at the center of our galaxy, it is, by definition, impossible to see. Black holes, after all, are collapsed objects with a gravitational pull so great that not even light can escape.

All the same, this morning, at a National Press Club even in Washington, D.C.