NASA’s SPHEREx maps interstellar ice in Cygnus X, shedding light on origins of Earth’s water
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NASA’s SPHEREx has mapped vast reservoirs of water ice in the Cygnus X, offering new insights into how water and life-forming molecules may have reached planets like Earth.
Located about 4,500 light-years away, Cygnus X is one of the most active stellar nurseries in the Milky Way.
Observations show that massive ice deposits, described as interstellar glaciers, are spread throughout the region’s giant molecular cloud and contain key chemical ingredients linked to the formation of life.
The findings were published on April 15, 2026, in The Astrophysical Journal by a team led by Joseph Hora of the Harvard-Smithsonian Center for Astrophysics.
Launched in March 2025, SPHEREx is scanning the sky in 102 infrared bands and is currently conducting the first of four planned full-sky surveys. The data revealed that ice extends farther across Cygnus X than previously known, particularly in regions shielded by dense dust lanes made up of extremely fine particles.
Scientists say these dust layers act as a protective barrier, helping preserve water and other molecules in the harsh environment of space.
Researchers believe such ice-rich regions could play a crucial role in planet formation. As new star systems develop, these frozen materials may become incorporated into forming planets, potentially delivering water and essential compounds needed for life.
The mission, expected to last two years, aims to map the distribution of cosmic ice across the galaxy, helping scientists better understand how planetary systems acquire the building blocks for life.