"In physical cosmology, a cosmological horizon marks a limit to observability, and marks the boundary of a region that an observer cannot see into directly due to cosmological effects."
Cosmological Horizon
"Observations of the universe are limited by the physical properties of light. Terrestrial observations are limited by the fact that light propagates in straight lines, while the surface of Earth is curved. The distance one can see can be increased by observing from a higher vantage point, but there is a limit: an observer on an infinitely tall platform could only see one quarter of the way around Earth's circumference. Astronomical observations are limited by the fact that light propagates with a finite velocity, c. The only objects that can be seen are those whose emitted light has had enough time, since the beginning of the Universe, to reach Earth today. In both cases, the physical limit to vision is called the horizon."
"In any case, it is interesting to note that the cosmological horizon is a maximal limit of perception and not an actual boundary. Much like an individual who is unable to see the edges of the Pacific Ocean while they are floating n the middle of it; we can only see the light from areas of space within the cosmological horizon."
55:33O ye assembly of Jinns and men! If it be ye can pass beyond the zones of the heavens and the earth, pass ye! not without authority shall ye be able to pass!
55:34Then which of the favours of your Lord will ye deny?
"The right of freedom of speech consists in speaking the truth."
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