It's a record that has been broken multiple times over the past two years alone, and one that we expect to see broken again soon.
Because light takes time to travel, any light reaching us from distant space represents an event buried deep in the past; so, in effect, light is a time machine for distant reaches of the Universe. But the early Universe – really early – is more challenging: it's so far away that any light that reaches us is very, very faint.
This makes detailed reconstructions of that time very difficult. Which is all the more the shame, since it's such a critical time.. Commencing nearly 250 million years after the Big Bang, it filled the entire Universe with an opaque cloud of hydrogen atoms. Thanks to this Epoch of Reionization, by around one billion years after the Big Bang light could once again shine unimpeded.Naturally, we want to know more about the Universe's youth during this foggy period; how those first stars formed in the dawn clouds, how galaxies came together, howin the first hundreds of millions of years of existence. Peering back at that distant, misty time is one of the primary tasks for which Webb is designed.
CEERS-93316, according to Donnan and his colleagues, has to be at least pretty close to one of the very first galaxies after the Big Bang. The team ruled out other potential explanations for the dim, red glow, and their analysis suggests that star formation in the galaxy candidate had to have started sometime between 120 and 220 million years after the Big Bang.
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