Recent content by sinebar

What if we replaced the laser with a metal disc with a radii of a billion light years and rotated it at 1 RPM. Would the outer edge of the disk be rotating faster than light?

This is probably just nuts but let's say you switch on a laser, point it to the sky and leave it on for billions of years until the beam has traveled billions of light years. Then you rotate the laser 360 degrees in let's say 1 RPM. Does the laser spot that is now billions of light years away...

Ok so at no point in the life of a photon does it ever have zero velocity? Even at the absolute instance of creation it is traveling at C? In other words a photon has never been at rest? If it has never been at rest then there must be absolutely no passage of time from creation to C?

When a photon is emitted from a particle, is it traveling at the speed of light upon being emmited or does it have to accerate from a zero velocity to the speed of light? If it starts out from zero velocity does it have rest mass?

Can anyone tell me if the speed of light in a vacuum was the same a few seconds after the big bang when the universe was small as it is today? In other words could it be that the speed of light changes as the universe expands? Also is it actually known why light travels at the speed it...