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