EDGES

EDGES (Experiment to Detect the Global EoR Signature) is a radio survey aimed at detecting highly redshifted 21-cm line from neutral atomic hydrogen (HI) during the epoch of reionization. It uses a purpose-built telescope array located at the Murchison Radio-astronomy Observatory (MRO) in western Australia. A signal detection was announced in 2018, but the finding was inconsistent with other analogous observations, and is no longer claimed to be such a detection. There have been three versions of EDGES:

• EDGES-1, introduced in 2006.
• EDGES-2, result of 2010-2016 improvements.
• EDGES-3, introduced in 2022.

EDGES-3 was tested in Oregon in 2022, after which it has observed at MRO, except for short campaigns located at Davon Island (Canadian far north) and Adak Island (Aleutian Islands, Alaska).