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Astrophysics/LIMIT OF SPACE
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Question
If the universe is expanding, what is the limit(or definition) of that quantity(space or anything else), in which the universe is expanding?
That is currently one of the unknowns in science, the limit to which space can expand. However, your questions is somewhat badly phrased. The universe is infinite and yet doesn't expand "into" anything. It is space, it defines space, it does not expand into space. Points in space get further apart, if you look at two of them, yet the entire universe is infinite, as we would define it according to relativity. It's a difficult concept to wrap your brain around.
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Steve Nelson
Expertise
Fusion, solar flares, cosmic rays, radiation in space, and stellar physics questions. Generally, nuclear-related astrophysics, but I can usually point you in the right direction if it's not nuclear-related or if it's nuclear but not astrophysics.
Experience
Currently a physics professor at the University of Texas of the Permian Basin. Doctoral dissertation was on a reaction in CNO-cycle fusion, worked in gamma-ray astronomy in the space science division of the naval research laboratory in the high-energy space environment branch.
Organizations
Physics professor at the University of Texas of the Permian Basin.
Education/Credentials
Ph.D. in physics, research was on nuclear fusion reactions important in stellar fusion.
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