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AT seminar 3 November 2017 by Alberto Dominguez (UCM)

Abstract: Galaxies in every corner of the universe have been sending out photons since nearly the beginning of time. These photons produce one of the diffuse backgrounds that fill the cosmos known as the extragalactic background light (EBL). This is the second most energetic diffuse radiation field, after the cosmic microwave background, and its understanding is essential to build a complete picture of galaxy evolution and cosmology. Furthermore, very high energy photons coming from extragalactic sources such as blazars (super-massive black holes with jets oriented towards the Earth) interact with the EBL. This effect makes the EBL interesting for the gamma-ray community, as it creates a connection between classical astronomy and high-energy astrophysics. We will review the latest achievements on EBL research, and answer the related historical question of why the night sky is dark? (Olbers' paradox)

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