Though i've always been familiar with the very (very) basic implications of relativity, I've only just now gone into the details in any way, and I'm experiencing the whole cliche of "having difficulty in wrapping my mind around the concepts". Maybe you who are more experienced than i could help shed some light on light for me. A couple questions: 1. Correct me if I'm wrong, but my basic interpretation is that if i started travelling in the +x direction, and i wanted to catch a photon going in the +x direction, no matter how fast i went, i would never be any closer to catching it than if i were standing still? -I derive this from the point that the speed of light is the same for any observer. -I interpret this as happening because the faster i go, time slows down for me proportionally to my speed, thus the photon is in a non slowed state compared to me and is going at a speed of c when i observe it? 2. (assuming im not wrong on the above) If this is the case, does this mean that how much time slows for you compared to an inertial observer is directly proportional to the % of the speed of light you're travelling? (Where if you could hit the speed of light time would stop?) So at 10% of the speed of light would time pass for my frame of reference 10% slower? 3. Im so utterly confused as to when velocity counts and when it doesnt. I'll cite the spaceship example, where if i blasted off in a rocketship near the speed of light and came back later, time would have passed faster on earth. But if there's no absolute frame of reference or stillness in the universe, then wouldnt the earth be moving near the speed of light relative to me? Yet time passes more slowly for me than them. What are the terms that determine who is really moving at what speed, if it's all relative?