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It seems to me that the expansion of the universe is only being looked at one way. a repelling force, basically being the opposite of gravity. After pondering this for many nights, I began to wonder if its possible that the changing pressure outside the universe could cause the expansion thst we observe.

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    $\begingroup$ It sounds like you are trying to articulate "brane" cosmologies. en.wikipedia.org/wiki/Brane_cosmology $\endgroup$ – Rob Jeffries Nov 9 '15 at 13:14
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    $\begingroup$ We've yet to see a proof of existence for any of this hyperspace stuff, so we can attribute lots of different properties to other dimensions without fear of being proven wrong. $\endgroup$ – Wayfaring Stranger Nov 9 '15 at 15:51
  • $\begingroup$ Article on a similar idea. universetoday.com/104863/… Dark Energy was discovered in 1998 and the idea that our universe is wrapped around an expanding 4 dimensional object was a kind of next logical step. It's certainly possible, but it's also possible that this theoretical 4th dimension doesn't exist. Observations so far have not detected any curvature that we might expect if our 3 dimensions were wrapped around a 4th. $\endgroup$ – userLTK Nov 11 '15 at 4:53
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Nobody really has any idea what "dark energy" is. But there is a principle known as Occam's razor. It can be expressed in various ways, for example "When an observation can be explained in many ways, the one with fewest assumptions should be used."

To explain the properties of dark energy as being due to changing pressure of hyperspace, requires the assumption that "hyperspace" exists, that it has a property that pressurizes the universe, that this "pressure" is changing, and that affects the rate of expansion of the universe.

There are other hypothesis: a cosmological constant, or a as yet undiscovered force field. None have much observational evidence, but have the benefit of requiring fewer assumptions.

As Rob mentioned what you describe is similar to "brane cosmology", in which the universe is embedded in a higher dimensional space. These could influence our space, by controlling the scale of a cosmological constant, making it small, but non-zero. As with much of string theory, the experimenters are well behind the theorists.

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