Gravity is supposed to slow time down. Going fast is supposed to do the same thing. Increasing gravity is the equivalent of accelerating greatly. However, if I only accelerate a little, I feel the equivalent of, say, the moons gravity, but I will still eventually reach sub-light speeds and experience relative slowing of time. Why isn't standing on the Earth and experiencing acceleration in space such that you experience earths gravity the same in that in space you're time slows down as you reach higher speeds, relative to an observer, but on Earth nothing changes? Many thanks.