An analysis of distant galaxies captured by NASA's James Webb Space Telescope reveals that they are extremely young and exhibit remarkable similarities to a rare type of small galaxy known as 'green peas' that exist in our cosmic backyard. “With detailed chemical fingerprints of these early galax
A trio of faint objects captured in the James Webb Space Telescope’s deep image of the galaxy cluster SMACS 0723 exhibit properties remarkably similar to rare, small galaxies called “green peas” found much closer to home. The cluster’s mass makes it a gravitational lens, which both magnifies and distorts the appearance of background galaxies. We view these early peas as they existed when the universe was about 5% of its current age of 13.8 billion years.
Green pea galaxy colors are unusual because a sizable fraction of their light comes from brightly glowing gas clouds. The gases emit light at specific wavelengths – unlike stars, which produce a rainbow-like spectrum of continuous color.
Additionally, the Webb spectra made it possible to measure the amount of oxygen in these cosmic dawn galaxies for the first time.
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