# Can the shape of the universe be inferred from the CMBR?

COBE, WMAP, Planck compared to each other http://www.scidacreview.org/0704/images/cmb07.jpg [Broken]

Methinks the distribution of the CMBR intensity as seen from Earth's perspective could indicate the overall shape of the universe. Is so, the greater is the distance between the boundary of the universe and Earth, the less intensity would be the CMBR as seen from Earth, and vice verse. Just as the Earth is not a perfect sphere, the Universe could resemble a sphere but rather than being a perfect sphere, it has intrusions and protrusions at its boundary, which causes the CMBR to deviate from uniformity. The Planck satellite reveals that variations of the CMBR are gradual, with places that are colder tend to be gradually colder than their surrounding areas, and vice versa. Could this suggest the boundary of the universe is almost a sphere but with gradual protrusions and intrusions at its boundary? What do you think? :tongue:

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mathman
Your assumption that the universe has a boundary is not accepted by current theory.

mfb
Mentor
I think you mean visible universe. It is not a perfect sphere, but it is extremely close to that.

I think you mean visible universe. It is not a perfect sphere, but it is extremely close to that.

This is correct. I should have specified visible universe. Thanks for the correction.

Your assumption that the universe has a boundary is not accepted by current theory.

A fish tank has a boundary yet fish don't see the boundary. If there are other universes outside our own, their space may push against the boundary of our universe, which causes intrusions inward from the boundary of our universe, and our space may likewise push against their space, which causes protrusions outward from the boundary of our universe.

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mfb
Mentor
If there are other universes outside our own, their space may push against the boundary of our universe, which causes intrusions inward from the boundary of our universe, and our space may likewise push against their space, which causes protrusions outward from the boundary of our universe.
Please stick to actual science, wild speculations without any background are not allowed here.

The shape of the observable universe can be observed (...), the shape of the whole universe might be inferred, but "universes" "pushing" each other is not a scientific theory.

Please stick to actual science, wild speculations without any background are not allowed here.

The shape of the observable universe can be observed (...), the shape of the whole universe might be inferred, but "universes" "pushing" each other is not a scientific theory.

I was suggesting a possible cause for protrusions and intrusions of space at the boundary of the universe, supposing such a boundary and protrusions and intrusions exist. Suppose that our own universe is like a fish tank. The water in the tank is not completely calm, but as objects say fish in the tank move around, the water gets swirled around. Likewise, the space in our universe may not be calm but could also be swirling around like water in a fish tank, possibly from movement of galaxies or other bodies suspended in space. But now, suppose the boundary of universe or universes are like clear plastic bags, ones that used to contain water and fish at carnivals, we would not be able to see boundaries of universes or detect swirling around of space, but space could push against the boundary like water can push against a plastic bag, causing intrusions and protrusions of space between universes much like if we put two such bags of water next to each other and move the water about in each bag, the two bags would push against each other, causing intrusions and protrusions about the two bags.

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mfb
Mentor
Okay, that post is so full of misconceptions that it is pointless to continue here. Please read books or other explanations about the concepts of space, visible universe and universe first before you start speculations.
A good introduction is this balloon analogy thread.