Unveiling galaxies at cosmic dawn that were hiding behind the dust

While investigating the data of young, distant galaxies observed with the Atacama Large Millimeter/submillimeter Array, astronomers noticed unexpected emissions coming from seemingly empty regions in space that, a global research team confirmed, came actually from two hitherto undiscovered galaxies heavily obscured by cosmic dust. This discovery suggests that numerous such galaxies might still be hidden in the early Universe, many more than researchers were expecting.

source https://www.sciencedaily.com/releases/2021/09/210922121803.htm