- \n
- Galaxies come in many different shapes and sizes<\/strong>. Our own Milky Way galaxy is a flattened disk.<\/li>\n
- \u201cUFO galaxies\u201d are a type we only discovered recently<\/strong>. They are disk-shaped, bright red and really dusty.<\/li>\n
- Astronomers found them using the Webb Space Telescope<\/strong>. They are only visible in infrared light, so remained undiscovered until Webb saw them.<\/li>\n<\/ul>\n
Looking for a good astronomy-themed Christmas gift? The 2025 EarthSky lunar calendar is now available! A unique and beautiful poster-sized calendar. Get yours today!<\/p>\n
Mysterious \u2018UFO galaxies\u2019<\/h3>\n
Scientists are investigating UFOs in deep space. But these aren\u2019t the kind of unidentified flying objects you probably think of when you hear that term. Instead, these are galaxies that are big, red and really dusty. They\u2019re only visible in infrared light, and NASA\u2019s James Webb Space Telescope (JWST) was the first to find them. Scientists call them Ultra-red Flattened Objects (UFOs). On November 19, 2024, a team of researchers led by the University of Colorado Boulder (CU Boulder) said it\u2019s starting to find answers about these enigmatic galaxies, such as their common shape.<\/p>\n
They published their peer-reviewed findings in The Astrophysical Journal<\/em> on October 3, 2024.<\/p>\n
Invisible \u2026 until now<\/h3>\n
Justus Gibson in the Department of Astrophysical and Planetary Sciences at CU Boulder is the lead author of the study. He and his fellow researchers wanted to know more about these unusual galaxies. They seemed similar in size and shape to other galaxies like our own Milky Way. But why were they so red and dusty? Why hadn\u2019t astronomers seen them before Webb? Gibson said:<\/p>\n
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JWST allows us to see this type of galaxy that we never would have been able to see before. It tells us that maybe we didn\u2019t understand the universe as well as we thought.<\/p>\n<\/blockquote>\n
Co-author Erica Nelson at CU Boulder added:<\/p>\n
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They\u2019re so visually striking. They\u2019re enormous red disks that pop up in these images, and they were totally unexpected. They make you say: \u2018What? How?\u2019<\/p>\n<\/blockquote>\n
![\"Younger](\"https:\/\/earthsky.org\/upl\/2024\/11\/Justin-Gibson-CU-Boulder-e1732635339940.jpg\")
Justin Gibson of CU Boulder is the lead author of the new paper. Image via CU Boulder.<\/figcaption><\/figure>\n Galaxies that only Webb can see<\/h3>\n
The galaxies\u2019 redness and the fact that telescopes like Hubble hadn\u2019t seen them before have a common explanation. They give off very little visible light. Therefore, human eyes and Hubble can\u2019t see them. But Webb is an infrared telescope. The galaxies do emit infrared radiation, so in Webb images, they appear bright red in color.<\/p>\n
The galaxies are closer to us than some that Webb has previously found. Those galaxies are incredibly distant, both physically and in time, much closer to the Big Bang itself. Astronomers thought they had a good idea of what the closer galaxies to us were like, so the UFO galaxies were a surprise. Gibson said:<\/p>\n
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Prior to the launch of James Webb, we thought we would find really, really far away galaxies. But we thought that closer to us, we already had a pretty good understanding of all the types of galaxies there are.<\/p>\n<\/blockquote>\n
![\"Array](\"https:\/\/earthsky.org\/upl\/2024\/11\/35-UFO-galaxies-Webb-space-telescope.jpg\")
View larger. | Collection of 35 UFO galaxies as seen by the Webb Space Telescope. Image via Gibson et al. 2024\/ The Astrophysical Journal (CC BY 4.0).<\/figcaption><\/figure>\n Why are they so dusty?<\/h3>\n
The researchers still aren\u2019t sure why these galaxies have so much dust in them. They contain about 50 times more dust than the Milky Way. As Nelson noted:<\/p>\n
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Why on Earth do these galaxies have so much more dust than all the other galaxies? Got me.<\/p>\n<\/blockquote>\n
The research team also ran simulations to find out just what shapes the UFO galaxies are. As it turned out, they are likely disk-shaped, just like our own Milky Way. Nelson said:<\/p>\n
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You have these big bad disks \u2013 like our home, the Milky Way \u2013 flying around space, completely invisible to us.<\/p>\n<\/blockquote>\n
Overall, galaxies come in many different shapes (and sizes), including disks, footballs and spheres.<\/p>\n
![\"Two](\"https:\/\/earthsky.org\/upl\/2022\/08\/UFOs-Hubble-vs-Webb-e1659634553986.jpeg\")
See one of the red UFOs \u2013 Ultra-red Flattened Objects \u2013 that appears in the Webb image (right), but not the Hubble image (left)? Webb is finding galaxies that Hubble missed. Image via Erica Nelson, et al.\/ arXiv.<\/figcaption><\/figure>\n Other red galaxies<\/h3>\n
Earlier this month, an international team of astronomers also reported on other red monster galaxies. These galaxies formed earlier, within the first billion years after the Big Bang, which occurred about 13.8 billion years ago. They were also red, dusty and almost as large as the Milky Way. Astronomers are trying to learn how they became so massive so soon after the Big Bang. Is there a connection to the other UFO galaxies?<\/p>\n
Bottom line: Astronomers using NASA\u2019s Webb space telescope have discovered \u201cUFO galaxies.\u201d They are disk-shaped, bright red and unusually dusty.<\/p>\n
Source: JADES Ultrared Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations<\/p>\n
Via University of Colorado Boulder<\/p>\n
Read more: UFOs \u2013 Ultra-red Flattened Objects \u2013 revealed by Webb<\/p>\n
Read more: Red monsters were massive galaxies in the early universe<\/p>\n
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\n - \u201cUFO galaxies\u201d are a type we only discovered recently<\/strong>. They are disk-shaped, bright red and really dusty.<\/li>\n