In this recording of a live talk (held on May 6th 2022) Dr Eloy de Lera Acedo explores the science behind understanding how the first stars formed and ionised the intergalactic medium, ~ 300 million years after the Big Bang, effectively transforming a mostly simple and empty universe into the realm of complex celestial objects we now know it to be today. The SKA (Square Kilometre Array), with its unprecedented imaging capabilities, will in a few years be able to image this unexplored epoch of the infant universe and a series of precursor instruments are already paving the way. Dr Eloy de Lera Acedo is a STFC Ernest Rutherford Fellow at the Cavendish Astrophysics laboratory of the University of Cambridge, from where he leads the Cavendish Radio Cosmology group and the REACH (Radio Experiment for the Analysis of Cosmic Hydrogen) project. Image credit: SKA Organisation/Swinburne Astronomy Productions

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