The James Webb Telescope Just Spotted a Galaxy That Shouldn’t Exist

Astronomers frequently gaze at computer screens that are speckled with light late at night in observatories and university labs. The majority of those dots are predictable. A few are far-off galaxies. Others are just noise. However, occasionally something happens that causes even experienced researchers to bend closer to the screen. That kind of moment appears to be present in the most recent James Webb Space Telescope images.

Scientists noticed several faint red points glowing brighter than expected in one of those images, which were located inside a patch of sky close to the Big Dipper constellation. At first glance, they looked like ordinary distant galaxies. However, after calculating the numbers, something didn’t feel quite right. For the time in cosmic history when they were supposed to exist, these galaxies seemed much too big and mature.

The galaxy JADES-GS-z13-1, for instance, seems to have formed approximately 330 million years after the Big Bang. In cosmic terms, that might sound ancient, but it’s hardly the beginning of the universe. Galaxies at that stage should still be tiny, disorganized collections of gas slowly forming their first stars, according to astronomers’ long-held belief. Rather, Webb appears to be unveiling something more akin to fully constructed systems, which are already enormous and brilliantly glowing.

There is a feeling of cautious disbelief among the research groups examining the data. “It’s bananas,” said Erica Nelson of the University of Colorado, describing the discovery in a way that seems unusually direct for academic science. It’s not just vivid language in the comment. It illustrates a real conflict between theory and observation.

The situation is uncomfortable because of the numbers. Similar in size to the current Milky Way Galaxy, some of these galaxies seem to have tens or even hundreds of billions of stars. However, there simply shouldn’t have been enough matter in the universe at that time for such massive structures to be constructed so quickly.

Webb’s Near-Infrared Camera, which is intended to detect the stretched light from extremely distant objects, was used by astronomers to identify the objects. Redshift is the term for the phenomenon where galaxies’ light shifts toward longer wavelengths as they move away from us due to the universe’s expansion. The farther back in time that scientists are seeing in Webb’s images, the deeper the red color. These galaxies are also very red.

Practically speaking, this indicates that their light has been traveling for over 13 billion years. Observing them is like traveling back in time to see a universe that is still encircled by dense clouds of neutral hydrogen gas. Light had difficulty escaping into space during that time, which is sometimes referred to as the cosmic “dark ages.” This further complicates the brightness of these objects.

Another team of researchers discovered something equally bizarre: light from hydrogen emissions piercing through that old fog. Normally, the signal—known as Lyman-alpha emission—shouldn’t become apparent until much later in the history of the universe, when the hydrogen haze was removed by intense radiation from early stars. And yet here it is, illuminating the storm like a lighthouse.

It’s difficult to avoid having a quiet sense of curiosity about what’s actually going on when you stand back from the data. The galaxies might not even be galaxies. They may be faint quasars, which are active areas that surround early supermassive black holes, according to some astronomers. Others wonder whether early stars formed far faster than existing models suggest, igniting bursts of star formation that built massive systems almost overnight.

The measurements might also be deceptive. A portion of the estimates are based on photometric methods, which basically use brightness analysis across various filters to determine mass and distance. Spectroscopy, the more conclusive approach, divides light into a spectrum similar to how a prism splits sunlight. That method provides much more certain confirmation of a galaxy’s age. That test has already been passed by one object. Many others haven’t.

The entire discovery is clouded by that uncertainty. While some researchers appear enthusiastic, others are wary, and some are subtly dubious. The scientific atmosphere is reminiscent of the early 1990s, when the Hubble Space Telescope began to uncover surprising structures in the early universe. Galaxies were supposed to form slowly at the time, according to textbooks. Soon after, observations indicated otherwise.

It is similar to seeing Webb’s discoveries come to fruition. The telescope returns images every few months that force astronomers to reevaluate long-held beliefs. It appears that the universe may have been constructing intricate structures earlier and more quickly than anticipated.

Whether these galaxies actually exist in the way that scientists believe they do is still up for debate. There are plans for more observations. We’ll examine more spectra. The image might alter once more.

However, a subdued mood is permeating astronomy circles. Some of the universe’s origin story may need to be rewritten if even one of these galaxies proves to be real, truly massive, and truly ancient. And that is frequently the most fascinating possibility in science.