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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interstellar medium simulations star formation astrophysics black holes astronomy planet formation protoplanetary disks planetary science stellar evolution radio astronomy exoplanets AGN binary stars observations galaxies instrumentation accretion spectroscopy supernovae cosmology stars habitability theory dark matter astronomical methods solar system transits galaxy evolution Kepler