Astronomers say they have discovered some of the earliest and most distant galaxies known to date using the James Webb Space Telescope.
"We've discovered galaxies at fantastically early times in the distant universe," said Brant Robertson, professor of astronomy and astrophysics at UC Santa Cruz.
The telescope captured light, emitted by the galaxies more than 13.4 billion years ago, at a time when the universe was only two per cent of its current age, the researchers say. Using spectroscopy, or separating light into its component wavelengths, the researchers were able to obtain more definitive redshift measurements.
Star formation in these early galaxies, he says, would have started about 100 million years earlier than the age they were observed, meaning the earliest stars would have formed around 225 million years after the Big Bang.
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