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JADES-GS-z14-0: The galaxy that was once the farthest known galaxy.

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JADES-GS-z14-0 is a high-redshift Lyman-Break galaxy in the constellation Fornax that was discovered in 2024 using NIRCam as part of the JWST Advanced Deep Extragalactic Survey (JADES) program. It has a redshift of about 14.18, making it one of the most distant galaxies and astronomical objects ever discovered. According to current theory, this redshift corresponds to a time about 13.5 billion years ago, approximately 300 million years after the Big Bang, or about 2% of its current age.

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JADES-GS-z14-0 was observed using the James Webb Space Telescope's Near-Infrared Spectrograph (NIRSpec) in 2024, and it measured a redshift of 14.32. Its age, size, and luminosity added to a growing body of evidence that current theories of early star and galaxy formation are incomplete.

A larger study using JWST NIRCam "Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic Star Formation Rate Density 300 Myr after the Big Bang" (Robertson et al. 2024) gave JADES-GS-z14-0 a photometric redshift of z = 14.39+0.23−0.09.

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JADES-GS-z14-0 is 1,600 light years (ly) wide and very luminous. Spectroscopic analysis revealed the presence of strong ionized gas emissions, including hydrogen and oxygen.