Dumb question alert: Isnt speed of light relative? For instance
if im on a spaceship which is travelling at 50% the speed of
light relative to a person standing on earth, and then on this
spaceship someone points a beam of light in the direction the
spacship is moving then isnt that beam of light now travelling
at 1.5 times the speed of light? Surely this could be tested on
a slower spaceship because the experuiment would be to get the
spaceship going as fast as possible then turn on a light beam,
and measure the speed of it from inside the spaceship. If light
has a universal maximum speed then the light in that spaceship
would travel slower than normal light because we need to
subtract the speed of the spaceship. Also if light does have
this max speed then it means the light somehow knows its being
measured within a spaceship travelling at x speed. Isnt that a
bit spooky?