SPHEREx maps interstellar ice highways
- NASA said April 15 that its SPHEREx space telescope mapped interstellar ice across the Cygnus X cloud complex, tracing frozen material through star-forming dust lanes. - The new maps span more than 600 light-years and identify water, carbon dioxide, and carbon monoxide ice attached to tiny dust grains. - SPHEREx is the first infrared mission built to survey such ice across the whole sky. (nasa.gov)
Stars form inside giant molecular clouds, cold clumps of gas and dust where gravity packs material tightly enough to ignite new suns. NASA said April 15 that SPHEREx has now mapped ice across one of those regions, Cygnus X. (nasa.gov) Ice in space is not a frozen lake. It is a thin coating on dust grains, carrying molecules such as water, carbon dioxide, and carbon monoxide through clouds where stars and planets take shape. (nasa.gov) SPHEREx, short for Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer, sees infrared light and splits it into 102 colors, like a prism making a rainbow. That lets the telescope identify molecules by their chemical fingerprints. (jpl.nasa.gov) The new Cygnus X maps cover a region more than 600 light-years across in the Milky Way. NASA said the water ice lines up with dark dust lanes, showing the frozen material sits in dense, shielded parts of the cloud. (jpl.nasa.gov) (nasa.gov) Lead author Joseph Hora of the Center for Astrophysics said astronomers expected to spot ice mainly in front of individual bright stars. Instead, SPHEREx used diffuse background light along the galactic plane to trace the spatial distribution of ice across entire dust clouds. (nasa.gov) NASA and JPL said that makes SPHEREx different from James Webb and the retired Spitzer telescope, which detected icy molecules in many places but were not designed to survey them over the whole sky. SPHEREx was built for that large-scale spectral census. (jpl.nasa.gov 1) (jpl.nasa.gov 2) The study describing the Cygnus X result was published April 15 in The Astrophysical Journal. An arXiv version said the H2O and CO2 absorption maps broadly trace dense, cold, well-shielded regions, while diffuse ice absorption also appears over wide areas. (nasa.gov) (arxiv.org) SPHEREx launched on March 11, 2025, and its planned two-year mission is to scan the entire sky in near-infrared light. NASA says one of its core jobs is measuring how much water and other life-linked ice exists in the Milky Way’s planet-forming regions. (nasa.gov) (jpl.nasa.gov) The result is less a map of “highways” than a chemical atlas of where frozen ingredients sit inside star nurseries. In Cygnus X, SPHEREx shows those ingredients following the same dusty structures that will feed future stars and planetary systems. (jpl.nasa.gov)
