Calleman Many people have now heard about the upcoming entry to the inner solar system of the comet Elenin (http://elenin.org) and there is a whole range of ideas and speculations about what this might entail. Comets have always been seen as harbingers of auspicious or (more commonly) ominous tidings and this one certainly is no exception. Ideas have been suggested that it is in fact a brown dw…