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Astronomers discover a cosmic Yeti: A massive galaxy from the early universe

An artist’s impression of what a massive galaxy in the early universe might look like. The galaxy is undergoing an explosion of star formation, lighting up the gas surrounding the galaxy. Thick clouds of dust obscure most of the light, causing the galaxy to look dim and disorganized, very different from galaxies seen today. James Josephides/Christina Williams/Ivo Labbe

Astronomers have spotted evidence of a massive and ancient galaxy, so old and so large that they compared finding it to spotting a cosmic Yeti.

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The Yeti hunt began when astronomer Christina Williams, a National Science Foundation postdoctoral fellow at the Steward Observatory, was looking through results from the Atacama Large Millimeter Array (ALMA) for another project. She spotted a strange blob of light that seemed to come from nowhere.

“It was very mysterious because the light seemed not to be linked to any known galaxy at all,” she said in a statement. “When I saw this galaxy was invisible at any other wavelength, I got really excited because it meant that it was probably really far away and hidden by clouds of dust.”

On further inspection, Williams and colleagues discovered they were looking at the remnants of a signal that took 12.5 billion years to reach Earth, meaning they were looking back at an event from the very early universe. The glow was formed as bright baby stars were born inside a young galaxy. Although giant clouds of dust obscured the galaxy itself, the glow of the stars illuminated the dust and lit it up.

The Yeti galaxy was extremely productive, creating stars nearly 100 times faster than our Milky Way. It could also offer the answer to the astronomical puzzle of why very large galaxies seem to mature so fast. Astronomers have seen massive mature galaxies, but they hadn’t seen massive galaxies growing before – it was as if they appeared fully formed.

“Our hidden monster galaxy has precisely the right ingredients to be that missing link,” Williams explains, “because they are probably a lot more common.”

The Abominable Galaxy

In order to learn more about how many massive mature galaxies may be out there, Williams and her team want to take observations from more parts of the night sky. Their first study covered only a very small sliver of the sky, and to find more monster galaxies they will need to search many more areas.

For this purpose, Williams is eagerly awaiting the launch of NASA’s James Webb Space Telescope (JWST) which will be able to see further and in greater detail than any telescope currently available. “JWST will be able to look through the dust veil so we can learn how big these galaxies really are and how fast they are growing,” she said, “to better understand why models fail in explaining them.”

The findings are published in the Astrophysical Journal.

Georgina Torbet
Georgina has been the space writer at Digital Trends space writer for six years, covering human space exploration, planetary…
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