This video clip starts by showning two black holes orbiting around each other against a gas nebula background. The camera pans out and the orbiting black holes recede into the distance. The nebular background is replaced with a grid which represents space. Waves eminate from where the black holes are oribiting. These waves represent the gravitational waves formed from the orbiting black holes.
Courtesy of Dr. Michelle Larson, Center for Gravitational Wave Physics, Pennsylvania State University. Used by permission.