A. Heaven.
B. It keeps going on forever.
Answers (3)
The question is meaningless. "Sky" is a onvenient term for the blue light we see when we look up. It is not an actual thing, like blue air or something. Once you get away from the Earth, "above" and "below" are meaningless.
Heaven is a Hebrew concept. There are three heavens. #1 is everything above the earth up to the sky. #2 takes in the sun and all the stars. #3 is where God lives. Other societies have concepts translated as heaven but they are different concepts. For instance, ancient China had a mountain in the north, the place of perfection, and a sea in the south, a place of confusion, and the earth was in the middle. So they called their land "Chung-gua", the middle kingdom, which we pronounce "China". It's easy to think that mountain was heaven, but there was no resemblance to the Hebrew heaven.
Nothing goes on forever. If the number of stars went on without limit, every line of sight would end on a star and space would be bright. Space is dark, so there is a limit to the number of stars.
Outer space. The physical “heavens” extend through earth’s atmosphere and beyond to the regions of outer space with their stellar bodies, “all the army of the heavens”—sun, moon, stars, and constellations. (De 4:19; Isa 13:10; 1Co 15:40, 41; Heb 11:12) The first verse of the Bible describes the creation of such starry heavens prior to the development of earth for human habitation. (Ge 1:1)
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If you are watching a movie, and on the screen, in a war movie, you see horses and beyond the horses you see elephants and beyond the elephants you see the sky with smoke, then what is beyond that? You know when the movie goes off, what is beyond is the screen, so is life. Everything in this world is a projection, it is energy. It is unfortunate that we do not realize the Truth that beyond the sky what you see in the cosmic universe is projection. You and me too are nothing but energy, this is Self-realization and enlightenment. We need to realize that. Even science agrees that every atom in this world is nothing but energy, everything is a projection, but we don't realize this. We must realize this Truth, then we will realize that everything above, below, inner, outer, is all energy.