speed of light

It's constant, right? Such that if you're traveling at half the speed of light, and shine a light forward, that light travels at the speed of light.

Say the vessel you travel in, passes by a floating space man. And that this space man turns on a flashlight at the same time the vessel turns on a light. Both lights pointed in the same direction.

The light from the space man travels away from him at the speed of light.

The light from the vessel travels at the same speed.

The light from both sources are parallel, right? So the shining light from the vessel traveling at half the speed of light, doesn't add to its speed?

So....if you were in a vessel traveling 99.9999% the speed of light. If you turned a light on, that light wouldn’t illuminate the path forward?