James Webb Telescope Discovers the Two Earliest Galaxies in the Known Universe

By Lydia Amazouz Published on May 31, 2024 07:00
James Webb Telescope Discovers The Two Earliest Galaxies In The Known Universe

The James Webb Space Telescope (JWST) has made a groundbreaking discovery, revealing the two earliest and most distant galaxies ever observed.

This significant find pushes the boundaries of our understanding of the universe's early formation and evolution, offering new insights into the conditions that prevailed during the universe’s infancy.

The Discovery

Astronomers using the JWST have identified two ancient galaxies, named JADES-GS-z14-0 and JADES-GS-z14-1, which date back to just 300 million years after the Big Bang. This discovery surpasses the previous record set by another pair of galaxies found by the JWST last year, which were dated to around 330 million years post-Big Bang.

James Webb Telescope Discovers The Two Earliest Galaxies In The Known Universe

These newly discovered galaxies are not only exceptionally old but also surprisingly large for their age. The ability of the JWST to peer back to such an early epoch in the universe's history is unprecedented, providing a direct look at how the first galaxies formed and evolved.

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The Significance of the Find

The larger of the two galaxies, JADES-GS-z14-0, measures approximately 1,600 light-years across, which is unusually large for such an early time in cosmic history. The sheer size and brightness of this galaxy suggest that it contains a substantial number of young, actively forming stars.

This rapid formation and growth challenge existing cosmological theories, which struggle to explain how galaxies could grow so quickly after the universe's birth. The discovery of such a massive galaxy so early in the universe’s timeline indicates that star formation processes may have been more efficient or different than previously thought. This also raises questions about the availability of raw materials and the conditions that facilitated such rapid growth.

Insights from the JWST

The JWST's powerful infrared instruments allowed astronomers to peer deeper into the cosmos than ever before. The galaxies were detected in a region of space known as the Hubble Ultra Deep Field. Previous observations with the Hubble Space Telescope revealed galaxies from the first 800 million years of the universe, but the JWST's advanced capabilities enabled the detection of even earlier galaxies.

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James Webb Telescope

The team used the telescope's Near-Infrared Camera for five full days to achieve these results. This extensive observation period allowed for the collection of high-resolution data, providing a clearer and more detailed view of these distant galaxies. The ability to observe at infrared wavelengths is crucial, as the light from these ancient galaxies has been redshifted due to the expansion of the universe, moving it into the infrared part of the spectrum.

Stellar and Galactic Evolution

The detection of JADES-GS-z14-0 and JADES-GS-z14-1 provides critical insights into the early universe. The presence of elements like hydrogen and oxygen in these galaxies indicates active star formation. The light signatures captured by the JWST show unprecedented details about the composition and behavior of these early galaxies.

Understanding these processes helps scientists piece together the history of star and galaxy formation in the universe. The data suggests that these galaxies were undergoing significant star formation, with young, hot stars contributing to their brightness. The presence of oxygen, a heavier element, indicates that multiple generations of stars had already lived and died, enriching the interstellar medium with the products of nuclear fusion. This rapid recycling of material into new stars is a key process in the evolution of galaxies.

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Comparison with Previous Discoveries

The JWST continues to surpass its own records, with these newly discovered galaxies being observed at 290 million years after the Big Bang. This means we are seeing them as they were when the universe was only 2% of its current age. The previous record holder, also detected by the JWST, was a galaxy observed at 325 million years after the Big Bang.

The discovery of JADES-GS-z14-0 and JADES-GS-z14-1 not only extends our observational reach further back in time but also provides a comparative framework to understand the growth and development of galaxies over the first few hundred million years. Each new discovery builds on the previous ones, allowing astronomers to refine their models of early galaxy formation and evolution.

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The Role of the James Webb Space Telescope

Launched in 2021, the $10 billion James Webb Space Telescope is a joint endeavor by NASA, the European Space Agency (ESA), and the Canadian Space Agency (CSA). Its mission is to see farther and deeper into the universe than any previous astronomical tool. One of its primary goals is to identify the first stars and galaxies that formed in the early universe. The telescope's large 6.5-meter mirror and highly sensitive instruments make it ideally suited for this task.

JWST's design allows it to capture faint light from distant objects, providing high-resolution images and spectra that reveal the physical and chemical properties of the earliest galaxies. By studying these ancient objects, scientists hope to understand the processes that governed the formation of the first stars and galaxies, shedding light on the origins of the complex structures we see in the universe today.

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Stellar and Elemental Composition

The detection of JADES-GS-z14-0 and JADES-GS-z14-1 has provided astronomers with a wealth of information about the stellar and elemental composition of early galaxies. The presence of elements like oxygen in these galaxies indicates that they had already undergone several cycles of star formation and supernova explosions, which create and disperse heavy elements.

This discovery is significant because it suggests that the processes of star formation and chemical enrichment were occurring much earlier and more rapidly than previously thought. The JWST's ability to detect these elements at such great distances demonstrates its unparalleled sensitivity and resolution, making it a critical tool for probing the early universe.

The James Webb Space Telescope's discoveries mark a new era in astronomy, providing unprecedented views of the universe's earliest galaxies and challenging our understanding of cosmic evolution. These findings highlight the telescope's capabilities and the importance of continued exploration and study of the cosmos, offering a glimpse into the conditions that shaped the very first galaxies and stars.


An editor specializing in astronomy and space industry, passionate about uncovering the mysteries of the universe and the technological advances that propel space exploration.

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