Labels:bulletin board | daily | encyclical | fence | poster | sky | skyscraper OCR: ich a detectable. We do ohser 7.5 shows background of gamma ra fers at different howthe observed intensit ives per frequencies (the number round could second) However this generated by have been, and probably ial black holes processes other than prir WS how the The dotted line in Fig. uency for intensit should vary witl ordial black gamma rays given off hy 300 per holes. if there were on refore say that cubic light -year. One car aray the observations of the positive background do not provi holes, but they evidence for primordial cannot be do tell us that on average light-year more than 300 in every that the universe. This limit nake primordial black holes obser intensi freuuencies twis juency intensity ravs aiven vear prmor dial everT
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