I watched a program the other day on Einstein's General Relativity. It was fascinating. As I understand it GR is the best model of the (large) Universe. The program stated that time literally passes slower nearer large masses than further away from them. And if I'm right in my understanding, this doesn't just mean clocks run slower, but that the "fabric" of space and everything in it moves more slowly near regions of mass. Kind of like running a game of life on my computer, and downgrading my computer when I'm near a large object, or upgrading to a supercomputer when I'm flying through space. They tested this with an atomic clock, one on the ground, and one up a mountain and after a few days there was a measurable difference. That was cool, but I started to think of more natural examples. Would, for example, a sample population of plants grow to bloom quicker in space than on the Earth's surface? This would, for me, demonstrate a kind of "time viscosity" depending on where you are in space.
Well ,for the person on earth ,the answer is yes!!.But for the person on the spaceship,he will experience the same life cycle of plant as on earth.This might seem like a paradox but Einstein showed that in fact,space and time are interrelated.
There is no way to tell if you have any absolute velocity or absolute time because that would mean choosing a particular special reference frame which according to general relativity is none.Moreover,if you were in the spaceship and let's say you spend your whole life sewing sweaters.The number of sweaters you sew on the spaceship will be the same as the number of sweaters you could sew on earth but when you come back to the earth more time would have passed on earth and your twin brother(let's suppose) would have sewn more sweaters than you.