Four galaxies investigated by the powerful space telescope are seen as they were just 350 million years after the Big Bang.
when it was less than 350 million years old and demonstrate the rapid emergence of the first generations of galaxies.
"It was crucial to prove that these galaxies do, indeed, inhabit the early universe.
The discovery confirms JWST's ability to perform one of its most important tasks — studying the early universe via light that has been traveling for so long that the expansion of the universe has stretched its wavelength. This stretching of light is calledthe longer the light travels, the further toward the red end of the electromagnetic spectrum the expansion of the universe shifts its light.
Thus far, the $10 billion observatory has identified several extremely high-redshift candidate galaxies, but these observations have to be confirmed using spectroscopy. Spectroscopy can be used to make the distinction between early galaxies and closer, more contemporary galaxies that might share similar properties, because spectroscopy can spot the characteristic fingerprints of specific elements. Early galaxies are composed of mostly hydrogen and helium, lacking heavier elements like oxygen, nitrogen and carbon.
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