Einstein's general theory of relativity suggests, among other things, that masses in space distort the geometry of space-time. In addition, moving objects emit waves of gravitational radiation that carry energy away into space.
Summaries of Spacetime, Relativity, and Quantum Theories for beginning and advanced visitors, with Links to the Best Websites on Space,Time, Einstein's Relativity, Quantum Gravity, Quantum Physics, Dark Matter and Energy, plus a discussion of the possibility that we live in an essentially atemporal universe.
The galaxy at the image center, Hercules A, also known as 3C 348, is actually over 1,000 times more massive than our Milky Way Galaxy, and the central black hole is nearly 1,000 times more massive than the black hole at our Milky Way's center. The physics that creates the jets remains a topic of research with a likely energy source being infalling matter swirling toward the central black hole. (Hubble Space Telescope/VLA radio telescope in New Mexico)
The "Black Widow" pulsar is zipping through the galaxy at a speed of almost a million kilometers per hour. A bow shock wave due to this motion is visible to optical telescopes, shown in this image as the greenish crescent...