In today’s astrobite, we discuss the opacity of the Universe to high energy photons. The cosmic gamma-ray horizon, constrained by the authors of this paper, is a measure of this opacity, a cosmological probe and means of estimating blazar redshifts.
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radio astronomy stars Kepler stellar evolution accretion binary stars galaxy evolution dark matter supernovae statistics solar system planetary science habitability AGN theory star formation galaxies planet formation black holes protoplanetary disks exoplanets simulations transits astrophysics cosmology astronomical methods spectroscopy observations astronomy instrumentation