There's a three month trial period http://dvd-shrink-software.de/tinidazole-tablets-ip-500mg-uses-in-hindi-ahdv tinidazole tablets ip 500mg uses in hindi To measure the spin of a black hole, the research team at Durham University in the UK first measured the distance between the black hole and its accretion disk, using optical ultra-violet and x-rays to view the heat generated as the black hole fed. The logic is simple: the further away the accretion disk is to the black hole, the slower the spin; the closer the disk is to the black hole, the faster the spin. According to the team, the spin on this particular black hole is relatively slow, at least compared to other black holes whose spin has been estimated to be "84 percent of the maximum allowed by Einstein's theory of general relativity," according to Space.com.