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In 2018, astronomers operating an experiment searching for signals from 'cosmic dawn' called EDGES in the Australian outback, claimed that radio waves of a certain frequency were significantly dimmer than other signals. It was heralded as a groundbreaking signal resulting from the birth of the first stars after the Big Bang — an event dubbed “cosmic dawn". This signal marked such a signature in the so-called 21 cm radiation produced by these ancient stars. EDGES, which stands for the Experiment to Detect the Global EoR Signature, is a collaboration between MIT Haystack Observatory and Arizona State University, funded by the National Science Foundation (NSF). It is located at the Murchison Radio-astronomy Observatory (MRO) in a radio-quiet zone in western Australia, with onsite infrastructure support provided by Australia’s CSIRO. The antennas and portions of the receiver were designed and constructed by MIT Haystack Observatory’s Dr. Alan Rogers and the Haystack team, working with project lead Judd Bowman, Raul Monsalve, and the ASU team. A ground-breaking and widely cited EDGES result, “An absorption profile centred at 78 megahertz in the sky-averaged spectrum,” was published in Nature in 2018. This result, if independently confirmed by other research groups, would have profound implications for our understanding of the early universe. In fact, the signals observed by EDGES were radically different from what cosmologists expected, crying out for an explanation as to why EDGES data suggested that the early universe was startlingly cold. This triggered huge theoretical activity and attempts to confirm the signal by other astronomers around the world. But now, a new experiment finds no hint of the ‘cosmic dawn’ claimed by EDGES. A team at the Raman Research Institute in Bangalore, India, has published a 'disconfirmation' -- the result of its search to reproduce the EDGES signals using a radio antenna called SARAS. The astronomers set a conical horn antenna afloat on a pair of remote lakes in India in early 2020. The SARAS team recently reported in Nature Astronomy that they found no trace of the dip observed by EDGES. Where do radio astronomers go next? Will the cosmic dark ages forever remain invisible? Let me know in the comments! Let's Connect: ?‍♂️ Twitter: https://twitter.com/DrBrianKeating ? Subscribe https://www.youtube.com/DrBrianKeating?sub_confirmation=1 ? Join my mailing list; just click here http://briankeating.com/mailing_list.php ✍️ Detailed Blog posts here: https://briankeating.com/blog.php ?️ Listen on audio-only platforms: https://briankeating.com/podcast.php A production of http://imagination.ucsd.edu/ Support the podcast: https://www.patreon.com/drbriankeating ... https://www.youtube.com/watch?v=YdC-OLmNwRw