According to researchers analyzing data from the Atacama Large Millimeter/submillimeter Array (ALMA) and the James Webb Space Telescope, the ultra-distant galaxy JADES-GS-z14-0 contained oxygen when the universe was less than 300 million years old. This chemical signature provides direct evidence that massive stars had already evolved, produced heavier elements, and dispersed them into surrounding gas during the earliest period of cosmic history known as Cosmic Dawn.
Webb Discovery and Redshift Measurements
NASA’s James Webb Space Telescope first identified the record-breaking system during observations for the JWST Advanced Deep Extragalactic Survey (JADES) programme, according to findings described by Stefano Carniani and Kevin Hainline. Using Webb’s Near-Infrared Spectrograph (NIRSpec), the team obtained a spectrum placing the galaxy at a redshift near 14, corresponding to approximately 290 million years after the big bang. Additional data from Webb’s Mid-Infrared Instrument (MIRI) showed excess brightness at longer wavelengths, which scientists interpreted as strong emission from ionized gas including hydrogen and oxygen.
Did you know? Redshift measures how much a galaxy’s light is stretched by the expansion of the universe, allowing astronomers to date ancient systems observed during the first few hundred million years after the big bang.
Independent ALMA Detections Confirm Oxygen
To test the inference of oxygen from brightness measurements, two independent teams analyzed data from ALMA, the telescope array in Chile, to search for specific chemical signatures. Sander Schouws and colleagues reported in The Astrophysical Journal a 6.6-sigma detection of the [O III] 88-micrometre line, representing oxygen atoms that have lost two electrons. This far-infrared emission was stretched by cosmic expansion into millimeter wavelengths measured by ALMA, yielding a precise redshift of 14.1793.
Simultaneously, Carniani’s team published an analysis in Astronomy & Astrophysics obtaining a matching redshift of 14.1796 from the same oxygen emission line. According to European Southern Observatory (ESO) announcements, this agreement between two independent teams using ALMA data strengthens the signal interpretation. Researchers emphasize that this represents ionized oxygen in galactic gas rather than a breathable atmosphere.
Stellar Enrichment in the Early Universe
The presence of oxygen requires nuclear processing inside stars, as the early universe initially consisted of hydrogen and helium. According to ESO guidelines on stellar evolution, massive stars consume their nuclear fuel rapidly on timescales of millions of years. When these stars complete their lives, supernova explosions eject newly synthesized heavier elements into surrounding space.
Modelling by Schouws’ team combined ALMA measurements with gas-emission data to estimate a heavy-element abundance of roughly five to twenty per cent of the Sun’s composition. Carniani’s modelling favored about seventeen per cent of the solar value. These figures represent chemical abundance relative to a reference composition rather than total mass. NASA dates the formation of our Solar System to approximately 4.6 billion years ago, meaning the broader process of stellar manufacture documented in JADES-GS-z14-0 operated far earlier in cosmic history.
Frequently Asked Questions
How far away is JADES-GS-z14-0?
Observations place JADES-GS-z14-0 at a redshift of approximately 14, meaning astronomers view the galaxy as it existed less than 300 million years after the big bang.
What telescope detected the oxygen?
While the James Webb Space Telescope first identified the galaxy and its distance, the Atacama Large Millimeter/submillimeter Array (ALMA) detected the specific 88-micrometre oxygen emission line.
Does this mean breathable oxygen was found in space?
No. The detection refers to ionized oxygen atoms present in the gas of a distant galaxy, not a breathable atmosphere.
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