A galaxy whose light has traveled nearly 13.5 billion years to reach us has just been confirmed as the earliest galaxy found to date.
By studying the oxygen content of the galaxy with the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers have precisely dated it to just 367 million years after the Big Bang, a time when the first lights in the Universe were still switching on and starting to propagate freely through space. The result confirms observations made by JWST, and offers new information about the early Universe that tells us about the origins of the elements.
"The first images of the James Webb Space Telescope revealed so many early galaxies that we felt we had to test its results using the best observatory on Earth," says astronomer Tom Bakx of Nagoya University in Japan.
"It was a very exciting time to be an observational astronomer, and we could track the status of the observations that will test the JWST results in real time."
The galaxy, named GHZ2/GLASS-z12, was first spotted by JWST in July of last year, not long after the telescope opened its segmented golden eye on the infrared light of the Universe.
A paper in November detailed the discovery, dating the galaxy back to approximately 350 million years after the Big Bang, which took place around 13.8 billion years ago.
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