NASA’s James Webb Space Telescope observes the interstellar comet 3I/ATLAS, using its ice-related signatures to analyze what the comet’s material is made of. A Southwest Research Institute-led study examines ice grains streaming from the object, only the third interstellar comet ever identified.
The findings describe the comet’s ice as tiny aggregates of water ice mixed with dust, with observations consistent with particles at micron or smaller scales. One outlet emphasizes the specific “dusty ice” character Webb detects and how it resembles ice conditions seen in “freezing worlds beyond Neptune,” while another highlights the match between 3I/ATLAS’s ice signatures and environments on those distant bodies.
Together, the coverage shows Webb is not just detecting an interstellar visitor, but also using its spectrum to compare its icy composition to the kinds of cold, dust-laden materials found far beyond Neptune.
