Comment on What do people claim they know of but really don't?
bizarroland@lemmy.world 12 hours agoAt the same time, though, every time the speed of light has been measured, it has always been the exact same, unless something was being done to it to cause it to slow down.
So we are highly confident that the speed of light in vacuum is a exactly equal to 299,792,458 meters a second.
Steve@communick.news 11 hours ago
Right. But it could be faster in one direction than the other, and we don’t have a way of knowing.
bizarroland@lemmy.world 11 hours ago
Light doesn’t really have a direction.
It only appears to have a direction in time.
From the point of view of the photon, it exists as an atomic emission, immediately hits its target, and is reabsorbed.
So there is no back for it to come from.
Steve@communick.news 10 hours ago
From the perspective of light, time itself doesn’t exist, so speed doesn’t exist.