Christian wrote:
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*snip* ...something called a 'false vacuum' ( is that the same as an 'atmosphere'?).
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I am qualified enough to tell you what a false vacuum is, at least as far as my own ego is concerned. A false vacuum is what you would think of as a vacuum. The fact of the matter is that everywhere is space there is an underlying layer (if you will) of undetectable energy. This energy can and does form pairs of electron and positrons (anti-electrons), which quickly annihlate each other in most cases, turning back into the energy that created them. Since there are always these pairs of particles, there can be no true vacuum.
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Dark matter is a prevailing idea, yes, but just an idea... it has never been observed.
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It has been observed. drguss said that baryonic dark matter has been observed, and he's correct. You see it every day. Heck, you *are* baryonic dark matter. At least one other form of dark matter has also been observed--neutrinos. The problem is that these forms of dark matter don't account for all of the dark matter that there should be according to the CMB and such.