JWST Detects 2 Primordial Gas Signals in GN-z11, Strengthening Case for First Stars
Updated
Updated · Futura · May 14
JWST Detects 2 Primordial Gas Signals in GN-z11, Strengthening Case for First Stars
2 articles · Updated · Futura · May 14
Two JWST studies found doubly ionized helium and hydrogen emission at Hebe, a source less than 10,000 light-years from galaxy GN-z11, offering the strongest evidence yet for Population III stars.
NIRSpec-IFU traced an unusual signal first seen two years ago to gas with no detectable heavy elements, the pristine hydrogen-helium mix expected to form the universe’s earliest stars.
The helium signature requires extremely intense radiation, and researchers said Population III stars best explain it; the companion hydrogen detection from a separate European team reinforced that interpretation.
GN-z11 is seen more than 13 billion years back in time, near the cosmic dawn when the first stars likely formed, lived only a few million years and seeded later generations with heavier elements.
The findings stop short of direct proof, but astronomers called them the most convincing clue so far and estimated the candidate stars at roughly 10 to 100 solar masses.
Have astronomers finally found the 'ghost stars' that first lit up our universe?
Is this a cluster of primordial stars or an exotic black hole mimicking the signal?
Breakthrough 2026 JWST Observations Reveal Compelling Evidence for Population III Stars in Early Universe
Overview
In April 2026, the James Webb Space Telescope (JWST) provided the strongest evidence yet for Population III stars by detecting a pristine gas clump called Hebe near the ancient galaxy GN-z11. Hebe’s composition, showing almost no heavier elements, matches what scientists expect from the universe’s first stars. Using theoretical models based on Hebe’s helium-to-hydrogen ratio, researchers inferred that these stars were likely very massive, between 10 and 100 times the mass of the sun. This discovery marks a major step in moving from theory to direct observation of the universe’s earliest stars and their role in cosmic evolution.