Improved Limits on the 21 cm Signal at z = 6.5–7.0 (the Epoch of #Reionization) with the Murchison Widefield Array Using Gaussian Information: https://iopscience.iop.org/article/10.3847/1538-4357/adff80 -> Astronomers hunting for evidence of the light from the first stars and galaxies have found that the Universe was warm, rather than cold, before it “lit up”: https://www.icrar.org/eor-limit/