As the author of these columns describing cutting edge physics and astronomy, I get quite a few letters and E-mail from readers who are more interested in ?over-the-edge physics and astronomy?. One recurring theme is various alternatives to the standard model of Big Bang cosmology. Perhaps the universe is not expanding; it?s just that light ?gets tired? on its path from far away and loses some of its energy. Perhaps quasars are closer than we think, particularly since some of them appear to be linked to closer galaxies. Perhaps relativity is wrong, and it?s the speed of light that is...