Hi, I'm 13 and I really really love Physics, so I thought it would be a good idea to join this Forum. I research Maths and Physics in my own time, as this year we don't seem to go past the tangent function in maths... I was looking into special relativity before diving into general (bad idea?) and I discovered it only affected 'static' objects. Although this may seem basic, I'm having difficulty understanding why a laser in a photon clock would move in a zig-zag pattern, when it is moving as I would of thought, that when the photon was fired from the laser this was at a moment of time, and it would continue moving forwards from where it was shot, while the rest of the mechanism moves forwards. Help please?