In terms of horizons, you can only see up to the point where the earth begins to curve away from you, roughly how far is this. for example, if you were looking out to sea, how far can you see?
I know we can see galaxies far away, but that is emitted light. How far can the eye see in terms of horizons. If you were standing somewhere completly flat, how far can you see? Also, how far can you...
