Question

The speed of light is greatest in ​

Answer 1

Answer:

Not truly a constant, but rather the maximum speed in a vacuum, the speed of light, which is almost 300,000 kilometers per second, can be manipulated by changing media or with quantum interference.

Answer 2

Answer:

Photons, by their very nature, cannot exceed the speed of light, but particles of light are not the only massless entity in the universe. Empty space contains no material substance and therefore, by definition, has no mass. ... "Therefore, empty space can certainly expand faster than light.