Scientists have detected heavy water in the planet-forming disk around young star V883 Orionis, confirming the water existed long before the star formed. The discovery, made using ALMA, shows that water’s origins trace back to ancient interstellar clouds, linking molecular gas, comets, and planetary systems across billions of years.Scientists have detected heavy water in the planet-forming disk around young star V883 Orionis, confirming the water existed long before the star formed. The discovery, made using ALMA, shows that water’s origins trace back to ancient interstellar clouds, linking molecular gas, comets, and planetary systems across billions of years.