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Massive disk galaxy could change our understanding of how galaxies are born - Space.com

Massive disk galaxy could change our understanding of how galaxies are born - Space.com

Massive disk galaxy could change our understanding of how galaxies are born - Space.com
May 21, 2020 1 min, 2 secs

It's a disk galaxy, much like our own Milky Way.

A massive, rotating disk galaxy that first formed just 1.5 billion years after the Big Bang, could upend our understanding of galaxy formation, scientists suggest in a new study. .

In traditional galaxy formation models and according to modern cosmology, galaxies are built beginning with dark-matter halos.

Disk galaxies, like our own Milky Way, form with prominent disks of stars and gas and are thought to be created in a method known as "hot mode" galaxy formation, where gas falls inward toward the galaxy's central region where it then cools and condenses. .

But the newly discovered galaxy DLA0817g, nicknamed the "Wolfe Disk," which scientists believe formed in the early universe, suggests that disk galaxies could actually form quite quickly. .

The disk appears extremely massive and stable for something so young.

So how could such a massive galaxy form so quickly, so early in the universe? .

Researchers suggest that the galaxy might have formed by a process known as "cold-mode accretion." They think that the gas falling in towards the galaxy's center was actually cold so, because the gas didn't need time to cool down as it approached the galactic center, the disk was able to more rapidly condense. .

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