I have just encountered an interesting hypothesis on the nature of dark matter. The author proposes that electrons, stripped from matter falling into black holes, comprises dark matter. THis is my first post, so I respectfully ask two questions: -How would electron clouds interact with photons? In other words, would such a cloud really be "dark"? - Secondly, I have read that dark matter seems to be a spherical region around the discs of galaxies. How can one explain this shape if dark matter has a gravitational effect? Rotation would be a problem, and if it is just an unstructured cloud but there is 5 times as much of it as baryonic matter, why wouldn't it collapse or exert huge pressure at its centre? [link to unverified personal theory removed - Zz.] Thanks for any attention that this gets.