It is a rather complicated subject. To put it simply, it is an extension of string theory, where higher dimensional "membranes" exist, and the collision of two membranes was possibly the cause of our own Universe. We supposedly live in a three-dimensional "brane". According to string theory there are ten spatial dimensions plus time.
Oliver Cox, Robert Blauner, and Herbert M. Hunter
It is a scientific theory
Theory-practice-theory take existing theory in education, apply to distance learning, develop new theory Practice-research-theory see what is happening in distance learning, submit to research, develop theory from results Theory-theory-research/practice build on an initial theory to develop a second theory, then apply and test it
A common theory is a theory which has not been proven or a theory without evidence.
Novanet: THEORY
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Depends what you mean by "respectably." M Theory, a type of string theory, requires the existence of eleven dimensions in which the strings can vibrate. If you consider M Theory to be "respectable," then the answer is eleven. If your view of M Theory is that, "It's so bad a theory that it's not even wrong," then you might say that eleven dimensions is not respectable.
It is generally agreed that the M stands for "membrane" though the words magic, matrix, mother, and some others, have been suggested. The scientist who named this theory actually didn't say what the "M" stands for.
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Great question. There is no one on the Internet nealy smart enough to understand m theory enough to explain that to you
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M-theory
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