We are approaching the celebration of the 70th anniversary of the discovery on March 25, 2021 of radio emissions from neutral hydrogen near 1420 MHz. On March 25th, 1951, the very first detection of hydrogen using a radio telescope with a horn antenna sticking out of a window on the 4th floor of the Lyman Physics laboratory at Harvard University was accomplished. This capability is the foundation of further discoveries allowing us to see the universe in a way never possible before.
