concept question

[andytran]

i'm jux wondering would a laser mounted on a spaceship travelling at half the speed of light... wouldn't this make the speed of the laser on the ship change to 1.5c??

thx

[chroot]

No. The speed of light is always locally measured to be c. This is the first postulate of special relativity.

- Warren

[NateTG]

People who see the spaceship moving at 0.5 times the speed of light would see the laser at a different (blue shifted) color that the people on the spaceship.

[andytran]

but the observer still see the speed of the laser to be c.?
so the speed the stay the same, only the wavelength change according to the observer perspective??