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