This sort of motion is common in galaxies sporting active central supermassive black holes, like the one in the nearby elliptical galaxy M87. Astronomers have measured motion in M87’s ejecta as rapid ...

If you could observe people moving at "normal" speed, Pravica said, they would appear to be moving in slow motion. There is one sense in which we could move at close to the speed of light.

The speed of light is 299,792,458 meters per second and that constant tells us much about cause and effect in the universe.

Scientists have for the first time observed the early universe running in extreme slow motion, unlocking one of the mysteries of Einstein's expanding universe. The research is published in Nature ...

This, of course, is light, traveling as it does at the absolute speed limit of the Universe: 300,000 kilometers per second (186,000 miles per second).