James Webb spots the early galaxies responsible for tidying up the universe
The era of reionization is estimated to have lasted for around 600 million years, ending approximately one billion years after the Big Bang, or approximately 13 billion years ago.
Ionization began as the first stars and galaxies began forming, heating the cooled, dense, opaque and light-absorbing gas that filled the universe. As those galaxies formed, their ionization bubbles grew, eventually merging to form our modern transparent universe – assuming, of course, there aren't dark, deep non-ionized corners of the universe out there somewhere.
For every mystery it shines a light on, the JWST seems to expose more unknowns, said EIGER project member Anna-Christina Eilers of MIT, lead author on another of the team's papers."We still can't explain how quasars were able to grow so large so early in the history of the universe. That's another puzzle to solve!"
The EIGER team has five additional observational fields to examine for their project, but according to NASA they couldn't wait to share the results from their first batch of observations."We expected to identify a few dozen galaxies that existed during the Era of Reionization – but were easily able to pick out 117," Kashino noted."Webb has exceeded our expectations." ®
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