First of all, hello forum. I'm new. Alright, so I was recently informed of two things. I'm no physics student, but nonetheless I was still interested in these things. 1. The speed of light is always constant for all observers. 2. To compensate for the paradox of a light particle having two different velocities to two different observers, time slows down in any region that the speed of light should be "increasing", and speeds up in any region that should be "decreasing". So let's say I have observers A and B. A is stationary, while B is traveling in a straight line at a constant velocity. By the last two points, B's velocity doesn't mean that B's light is traveling slower than the speed of light relative to B, but rather, the light still travels at the speed of light relative to B. For A, this doesn't mean that B's light travels faster relative to A, but instead, B's light still travels at the speed of light relative to A by slowing down B's passage through time. Well, here's a paradox I can't understand. Since motion is relative, won't A be saying that B is slowed down in time, and vice versa? They both can't be slowed down in time... or am I just not thinking physics-like? Well, forgive my 14 year-old brain for not grasping it if that's the case. :uhh: As far as I'm concerned, they both can't be seeing one another slowed down in time. So what happens when B observes A back? And I'm sorry if this is in the wrong forum section. I'm pretty sure that this fits under general relativity, but then again, I'm no student of physics.