Bubble of Galaxies

September 11, 2023

Astronomers have discovered the first “bubble of galaxies,”
Bubble of galaxy is an unimaginably huge cosmic structure measuring one billion light-years across that is thought to be a fossilized remnant from just after the Big Bang.
The bubble spans 820 million light years away from the milkyway.
The heart of the bubble is the Bootes supercluster of galaxies, which is surrounded by a vast void sometimes called “the Great Nothing”.
The bubble contains several other galaxy superclusters, including the massive structure known as the Sloan Great Wall.
Formation – The discovery confirms a phenomenon first described in 1970 by US cosmologist Jim Peebles.
He theorised that in the primordial universe the churning of gravity and radiation created sound waves called Baryon Acoustic Oscillations (BAOs).
As the sound waves rippled through the plasma, they created bubbles.
Around 380,000 years after the Big Bang the process stopped as the universe cooled down, freezing the shape of the bubbles.
The bubbles then grew larger as the universe expanded, similar to other fossilised remnants from the time after the Big Bang.