Abstract
The Advanced Telescope for High‐energy Astrophysics (Athena) is the second largest mission selected by European Space Agency (ESA) in the “Cosmic Vision” program, with a launch foreseen in 2030. The mission has been designed to answer two of the most outstanding astrophysical questions: How did ordinary matter assemble into the large scale structures we see today? and How do black holes grow and shape the universe? Thanks to its angular resolution, effective area, spectral resolution, and grasp, Athena will be the most powerful X‐ray observatory ever flown and, besides addressing the above mentioned questions, will provide important results for virtually all classes of astrophysical objects, from high‐z gamma ray bursts to the closest planets in our solar neighborhood.
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