A bizarrely-shaped black hole could cause Einstein’s general theory of relativity, a foundation of modern physics, to break down
Supermassive black hole’s relativistic spin rate measured for the first time
Two X-ray space observatories have teamed up to make the first measurement of a supermassive black hole’s spin.
Would a ship travelling at the speed of light have its own gravity?
What would the effects be if we were able to approach, or even reach, light speed?