Re:Equivalence principle of general relativity holds even at...
by hymen0ptera on Thursday July 05, 2018 @05:48AM
(#17461972)
Interestingly enough, as a fun side effect of radial motion, the lateral motion of shadows can transit an object exceeding speeds faster than the speed of light constant, C.
From Wikipedia:
Light spots and shadows
If a laser beam is swept across a distant object, the spot of laser light can easily be made to move across the object at a speed greater than c.
Of course, the shadow must already be cast, in a continuous stream of uniquitous photons, which all need to be arriving upon the reflective surface at the speed of light, before the shadow can transit the surface within the area of effect.
From Wikipedia:
If a laser beam is swept across a distant object, the spot of laser light can easily be made to move across the object at a speed greater than c.https://en.wikipedia.org/wiki/Faster-than-light
Of course, the shadow must already be cast, in a continuous stream of uniquitous photons, which all need to be arriving upon the reflective surface at the speed of light, before the shadow can transit the surface within the area of effect.