3 ms·

the idea of universe size increasing speed now comes to my mind, if the speed is greater or equal to speed of light, how we can be sure that we won't see ourse

• lutusp 14y ago
  > if the speed is greater or equal to speed of light, how we can be sure that we won't see ourselves in telescope? That doesn't follow. We can't see an object moving away at greater than C, so we also can't see ourselves. There is one place where we might see the backs of our own heads -- while observing at the event horizon of a black hole, all practical considerations aside. At that location, the spacetime curvature is such that light emitted "horizontally" would curve around the horizon (and the black hole) and reappear 360 degree away -- for example, from the opposite direction of someone shining a laser beam "horizontally" along the horizon. > I mean, even if the radius is infinite, because speed is increasing, we should see sun light returning to us over universe surface at some point No, not really.