Science : Advanced life may have peaked billions of years ago

Advanced life may have peaked billions of years ago

Earth formed 4.5 billion years ago, and we, the advanced life capable of interstellar communication, only just appeared. So using us as a benchmark, it’s about 4.5 billion years after the right black holes in the right galaxies that advanced life can appear. Garofalo rounds it off to 5 billion years. “Thus, we assume a fiducial value of 5 billion years, which brings us to 7.8 billion years after the Big Bang, or 6 billion years ago.”

At this point, an astute reader might wonder about metallicity. There was lower metallicity 6 billion years ago, so wouldn’t that have affected the types of planets that form and whether or not advanced life could arise on them?

Not necessarily.


Garofalo points out that the galaxies where the critical AGN are most likely to exist are isolated elliptical galaxies. But they’re not the old red and dead elliptical galaxies. The ones Garofalo is talking about are different. Instead, “these isolated elliptical galaxies are not expected to harbour low metallicities because they are AGN-triggered by mergers with abundant cold gas, possibly from a disk-like galaxy,” he explains. The old red and dead elliptical galaxies are also known to be populated with older stars and dominated by M dwarfs or red dwarfs whose habitable zones are “closer to the star and subject to stellar flares and tidally locked rotation, which work against the development of life,” Garofalo writes. But the subset of elliptical galaxies he’s talking about isn’t dominated by red dwarfs.

https://universetoday. com/161309/advanced-life-should-have-already-peaked-billions-of-years-ago/

Re: Advanced life may have peaked billions of years ago

TL|DR

tits or GTFO

My password is password

Re: Advanced life may have peaked billions of years ago

That was interesting until it started tossing around the D word. Obviously, the author has something against Little People.

Re: Advanced life may have peaked billions of years ago

….dick? little dicks?

My password is password
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