The farthest known galaxy is 13.2 billion years old

Sponsored Links

Jon Fingas
September 7, 2015 4:08 AM
The farthest known galaxy is 13.2 billion years old

Scientists have long reckoned that the first galaxies came into being roughly 500 million to 1 billion years after the Big Bang, but finding these ancient celestial bodies is tricky when their light is so faint that even many specialized tools aren't up to the job. However, researchers have managed to spot a galaxy so old that it's making them question the established timeline for the universe. They've determined that the recently discovered EGS8p7 galaxy is a whopping 13.2 billion years old, making it both the farthest known galaxy to date and just 600 million years younger than the universe as we know it. Theoretically, it shouldn't be possible to see the galaxy at all -- in EGS8p7's era, space was supposed to be full of neutral hydrogen clouds that absorbed radiation and made galaxies invisible to later observers.

The discoverers have some theories for why they found this extremely distant star hub. The hydrogen reionization in its era may have been patchy, making it feasible to spot some galaxies but not others. Also, EGS8p7 may have been populated by exceptionally hot stars that created a giant hydrogen bubble and broadcast the galaxy's presence. Whatever factors led to this rare sighting, it's clear that humanity's understanding of the oldest galaxies still needs some fine-tuning.

[Image credits: NASA/ESA/R. Ellis (Caltech)/HUDF 2012 Team, Flickr (top); I. Labbé (Leiden University)/NASA/ESA/JPL-Caltech (bottom)]

Turn on browser notifications to receive breaking news alerts from Engadget
You can disable notifications at any time in your settings menu.
Not now

EGS8p7 is nothing but a dot to space telescopes

All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission. All prices are correct at the time of publishing.
View All Comments
The farthest known galaxy is 13.2 billion years old