I'm a physicist, and let me tell you: we are working very hard to find an answer!

Exactly, agree with Monsier Harregarre. But I might add, the speed of darkness (absence of light) would therefore in theory be equal the speed of light.

Darkness merely consists of the absence of light, it's not matter of its own.

but i think if light speed is absorbed by a black hole it should mean that black darkness vectorial speed sould be less than - 3*10^8 or more