We’ve Just Seen The First Galaxies in The Cosmos taking Birth

Scientists have just recently identified the formation processes of some of the Universe’s initial galaxies in the turbulent age of the Cosmic Dawn.JWST observations of the early Cosmos around 13.3 to 13.4 billion years ago – merely a few hundred million years post the Big Bang – have bared telltale signs of gas reservoirs being aggressively slurped into three newly forming and expanding galaxies.”You could say that these are the first ‘direct’ images of galaxy formation that we’ve ever seen,” says Kasper Elm Heintz(astrophysicist from the Niels Bohr Institute in Denmark), who led the research.”Whereas the James Webb [Space Telescope] has previously shown us early galaxies at later stages of evolution, here we witness their very birth, and thus, the construction of the first star systems in the Universe.”

Recognized as the Cosmic Dawn, the first billion or so years post the Big Bang is veiled in two things: mystery, and the fog of neutral hydrogen that infiltrated the Universe and prohibited light from propagating freely. The former, actually, is the natural and direct result of the latter, since light is the tool we utilize to understand the Cosmos.

JWST was intended, in part, as an effort to penetrate this fog, since the infrared wavelengths in which it views the universe penetrate far more readily and travel distant than other wavelengths. What we want to understand is how everything came together – how, from a hot primordial plasma soup, the initial stars and galaxies came together, the fog cleared under the light of early objects, and the Cosmos took its baby steps towards what it is today.

So, Heintz and his global team used JWST’s powerful infrared eye to peer towards the Cosmic Dawn, where they discovered a signal traced to three galaxies. Precisely, the signal emanated from the neutral hydrogen surrounding them as the gas absorbed and reemitted the light of galaxies.

These galaxies, the scientists found, existed around 400 to 600 million years post the Big Bang, which occurred around 13.8 billion years ago. This makes the three galaxies some of the earliest detected.Furthermore, the researchers were successful in distinguishing the gas reservoirs around the galaxies from the intergalactic neutral gas. These reservoirs were determined to be considerably large, covering quite a large part of each galaxy, suggesting that they were very actively forming into galactic material. And the fact that there was such abundance of this gas also suggests that, at the time of the observations, the galaxies had yet to form most of their stars.