I have a question for you. We all know that the velocity of light is always c in a vacuum (barring mute or irrelavant side issues to avoid the question): I am an observer. However, I happen to be riding in a craft powered by a solar sail. We all know that light from a point source has an inverse square dispersal and that the further we go from the source the less flux you have per area. But for this question you are to assume that we are sufficiently far away from the source that the decrease in dispersal is minimal and can be neglected since the angle of the rays intercepting my sail are virtually parallel, yet my craft is small enough and light enough that at the start of my question my craft has an acceleration of 1 g. Just to avoid the arguement of energy source loss my craft is equipped with an expandable sail and for the minor change in flux I enlarge my collection surface. WHAT IS MY ULTIMATE TERMINAL VELOCITY TO THE SOURCE?