Early galaxies’ stars allowed light to travel freely by heating and ionizing intergalactic gas, clearing vast regions around them. Cave divers equipped with brilliant headlamps often explore cavities in rock less than a mile beneath our feet. It’s easy to be wholly unaware of these cave systems – e
There are more than 20,000 galaxies in this field. This James Webb Space Telescope view is found between the Pisces and Andromeda constellations.
Early galaxies’ stars allowed light to travel freely by heating and ionizing intergalactic gas, clearing vast regions around them. These galaxies look more chaotic than those in the nearby universe – they are clumpy and often elongated. These galaxies are also younger and are actively forming stars. The stars Webb detected are all more massive, which may lead to an abundance of colorful supernovae shooting off in these galaxies.
What allowed the universe to become completely ionized, leading to the “clear” conditions we see in the present-day universe? This image centered on quasar J0100+2802, captured by Webb’s NIRCam , shows compass arrows, scale bar, and color key for reference.
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