Interstellar comet 3I/ATLAS found releasing 40 kg of water per sec
Astronomers have detected water on interstellar comet 3I/ATLAS, only the third known visitor from another star system. Observed near Mars by ESA’s ExoMars TGO and NASA’s Swift Observatory, it releases about 40 kg of water per second despite being three times farther from Sun than Earth. Its icy, active surface hints at how life’s building blocks may travel between stars.