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