Five-dimensional black hole could “break” Einstein’s general relativity

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?

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