Gravity and speed through space has an effect on time. Increased gravity = slower time Increased speed = slower time When we look out at the stars and measure their spectrum, we see a red shift. This red shift is the result of the increase in the distance between the source of the light and us, otherwise known as the expanding of space. So if we were to fly towards a star, as we increase our speed, the light should shift more and more. Eventually it would pass down through the spectrum to gamma rays, and our space shuttle would be torn apart by the immensly high energy gamma rays. So the speed of light remains constant, but as you increase your speed towards the source of the light, your perception of time is slowed and the energy of the light shifts. Anything wrong with this?