  The study of extragalactic sources of high energy radiation via the direct
measurement of the proton and neutrino fluxes that they are likely to emit is
one of the main goals for the future observations of the recently developed air
showers detectors and neutrino telescopes. In this work we discuss the relation
between the inclusive proton and neutrino signals from the ensemble of all
sources in the universe, and the resolved signals from the closest and
brightest objects. We also compare the sensitivities of proton and neutrino
telescopes and comment on the relation between these two new astronomies.
