Could dark matter not exist?
Interesting, I always thought of dark matter as just a lot of extra "dust", the dust that clumps to make the stars that make up the universe.  The asteroid belt, the extra mass in our kuiper or oort clouds, etc.  The dust that blocks parts of our view of the Milky way.<p>This article (and others I'm now skimming) point out that dark matter needs other magical properties however.  Why is that the case?  Why does simple "dark dust" not fit?