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" ... Any particle with an electric charge is eliminated, as are the unstable ones that would decay. Neutrinos are too light; they were born hot and would represent a very different type of dark matter than we have, plus, based on our cosmic measurements, they can only make up about ~1% of the dark matter, at most. Composite particles, like the neutron, would clump and cluster together, shedding momentum and angular momentum too significantly; they’re too “self-interacting.” And the other neutral particles, like gluons, would also couple too strongly to the other normal stuff out there; they’re too “collisional.” ... "
" ... But the signal from the mass, inferred from gravitational lensing, illustrates that the majority of the mass is located where the blue contours are shown. This can only be true, given the wide variety of colliding clusters where this has been demonstrated, if some new form of mass obeys different collisional laws than normal matter does. The inescapable conclusion is that some new form of matter — dark matter — must make up the majority of the Universe's mass. ... "
" ... The observations —- made over a two-year period by the European Southern Observatory’s (ESO) Very Large Telescope (VLT) in Chile —- spot 36 craters larger than 30 kilometers in diameter — about one-fifth the diameter of Earth’s Chicxulub crater, the original impact of which likely killed off the dinosaurs 65 million years ago, the Massachusetts Institute of Technology (MIT) notes. Some are thought to be as large as 120 km in diameter. The craters, which cover some 10 percent of the asteroid’s surface indicate a very violent collisional history over the course of the asteroid’s few billion years of existence. ... "
" ... The thing is, when particles move through a medium, whether faster than light or slower than light, they are going to emit radiation either way. If you move faster than light, you produce both Čerenkov and collisional radiation. If you move slower than light, you produce Compton radiation (electron/photon scattering) or synchrotron shock radiation when you move slower than light. ... "