#measurement is the lowest such ratio ever measured in a Halley-type comet and at the lower end of values previously observed in other comets

New research using Atacama Large Millimeter/Submillimeter Array observations together with data from NASA Infrared Telescope Facility atop Mauna Kea show water in Halley-type comet 12P/Pons-Brooks matches that in Earth’s oceans, strengthening theory that comets helped make our planet habitable.