No. Not even one thousandth of the speed of light.
No.
ANY light traveling through the same medium (stuff) has the same speed.
The same as it is for any other vehicle.
299,792,458 m/s - the same as any other time. Your frame of reference does not change the speed of light.
I'm not even sure what this is supposed to mean. "Accessible" how?You can go into a black hole. You don't need "a vehicle travelling at near light speed" to do so (of course, if you're on Earth now and want to get to a black hole before you die, such a vehicle would probably be required, since all the ones we know about are at least tens of thousands of years away at any speed any Earth-built spacecraft has ever reached).You can't come out again. Period. Not in a vehicle travelling at "near light speed", not in a vehicle travelling AT light speed. The escape velocity for a black hole exceeds the speed of light in a vacuum.
The same as it is for any other vehicle. Montana does not have a separate commercial vehicle speed limit, save for mountainous areas of downgrades where vehicle over 26,000 lbs. GVWR will have a lower speed limit indicated in signage.
The speed of light does not have any media.
C To expound, gravity and light travel at the same speed. * It is a fundamental fact of nature that nothing can travel faster than light, but matter slows light while gravity is not slowed or screened by anything. So light and gravity only travel at the same speed in the vacuum of space away from any mass.
The speed of light. 300,000 km/h, is the fastest speed of any object in the universe.
E= hc/x
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
Speed that is the same at any given time is uniform speed.
"Radiant" sounds like "radiation", which should give you a clue. It travels at the same speed as any other electromagnetic radiation: the speed of light.