The Giant Metrewave Radio Telescope Cold-HI GMRT-CATz1 Survey

A team of astronomers from the National Centre for Radio Astrophysics (NCRA-TIFR) in Pune has used the Giant Metrewave Radio Telescope (GMRT) to measure the relative amounts of hydrogen gas and stars in galaxies in the early Universe. Their results show that star-forming galaxies nine billion years ago were primarily made up of neutral hydrogen gas.