We can see just about as far as nature allows us to see, and two things keep Earthbound humans from peering deeper into cosmic vastness. First, the universe has been evolving with time, and stars and galaxies did not always exist; therefore, light from most of the galaxies may not reach us, and thus we can never truly behold objects that have sprouted before the dawn of starlight. Second, the universe has been relentlessly expanding with time, and as it turns out, in a uniformly expanding universe, where the more distant things are receding more quickly, it is inevitable that there is a distance beyond which the apparent recession speed is faster than the speed of light so that light can't catch up.

This bleak frontier, the cosmological horizon, might well extend infinitely, barricading within its depths secrets of unfathomable proportion. However, if you could suddenly freeze time everywhere in the universe, and magically survey all of creation, you would find galaxies extending out far beyond what we can see today.
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