NASA’s James Webb Telescope unexpectedly spotted a massive spiral galaxy, and its extreme age could redefine everything we know about galaxy formation.
The gargantuan cluster, which has been assigned as a grand-design spiral galaxy, took scientists by surprise. Spiral galaxies tend to be younger than them. The James Webb Space Telescope (JSWT) is designed to see the oldest galaxies in the known universe. It can detect a wide range of infrared light, which the older galaxies emit in droves. The newly discovered galaxy designated A2744-GDSp-z4 is more than 12 billion years old despite its spiral formation, making researchers question what they previously believed about the formation of galaxies.
High redshift galaxies
Scientists gauge the age of galaxies through something known as redshift. Redshift is when light changes in frequency after traveling through space for a long time, which turns them into infrared waves. The more red a galaxy is, the older it is as its light has been traveling for a longer period.
A2744-GDSp-z4 is a redshift 3.0 galaxy, which means its light has been moving for more than 11.5 billion years. Grand-design galaxies are defined by their two spiral arms and tend to be a lot younger, making this find incredibly rare as very few of these galaxies have been designated above Redshift 3.0. Primordial galaxies of this classification originated shortly after the universe’s inception and are regarded as the most ancient.
The ultra-massive A2744-GDSp-z4 galaxy
🌌 A Stellar Whirlpool Across Time 🌌
— Orbit (@ORBITonSOL) January 2, 2025
The James Webb Telescope unveiled a stunning spiral galaxy from the early universe—A2744-GDSp-z4. Its grand design, featuring dual spiral arms, challenges our understanding of galaxy formation. With a redshift of over 3.0, its light traveled… pic.twitter.com/jc7rf3DGbF
The recently found galaxy is at redshift 4.03, which means it has been around for well over 12 billion years. This means that A2744-GDSp-z4 formed when the universe was a relatively young 1.5 billion years old. The galaxy took an extremely quick time to form, gaining around 10 billion solar masses every couple hundred million years. Its rapid formation and acquisition of material is making scientists rethink everything they thought they knew about how these celestial bodies form.
“The rarity of high redshift spirals might be a consequence of galaxies being dynamically hot at those early epochs,” said one of the researchers in the study. “Dynamically hot systems tend to form clumpy structures (instead of ordered ones).”
Scientists hypothesize that the galaxy may have formed with a stellar bar, a gas structure typically found within galaxies prompting star formation. Another theory posited by the researchers suggests that the cluster could have originated from the merger of two smaller galaxies. However, they do not think it is as likely a hypothesis as the stellar bar theory.
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