robert j. kolker wrote:
Paul Cardinale wrote:
The speed limit applies to matter, energy, and information as
viewed
from an inertial frame of reference. Anything that can move
without
carrying matter, energy, or information has no speed limit.
Examples
are: A laser spot, a projected image, a shadow, the propagation of
a
cut.
Is the spot really traveling?
Yes.
Or are we seeing a reflection here then there?
Yes.
When a lot spot moves or seems to move what is really moving?
The 'spot' is moving. The 'spot' is the location where the light is
reflecting. That location is not a physical object, but it does move.
Paul Cardinale
.
