it can travel from 380nm [nanometres] to 740nm
Yes, they travel some fast!
Copper is opaque to light - light can not travel though it.
the speed of light
really fast man. like super fast.
really slow
Yes.
Darkness is the absence of light and will therefore travel at the speed of light (6x108m/s)
A vacuum is the term that indicates through which light does not really travel.
yes
at the speed of light
Speed of light.
Approx 9.46 trillion km.