Life on other planets would likely be brief and become extinct very quickly, say astrobiologists from ANU Research School of Earth Sciences.
In research aiming to understand how life might develop, the scientists realised new life would commonly die out due to runaway heating or cooling on their fledgling planets.
“The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens,” said Dr Aditya Chopra, lead author on the paper, which is published in Astrobiology.
“Early life is fragile, so we believe it rarely evolves quickly enough to survive.”
“Most early planetary environments are unstable. To produce a habitable planet, life forms need to regulate greenhouse gases such as water and carbon dioxide to keep surface temperatures stable.”
About four billion years ago Earth, Venus and Mars may have all been habitable. However, a billion years or so after formation, Venus turned into a hothouse and Mars froze into an icebox.
Early microbial life on Venus and Mars, if there was any, failed to stabilise the rapidly changing environment, said co-author Associate Professor Charley Lineweaver from the ANU Planetary Science Institute.
“Life on Earth probably played a leading role in stabilising the planet’s climate,” he said.
Dr Chopra said their theory solved a puzzle.
“The mystery of why we haven’t yet found signs of aliens may have less to do with the likelihood of the origin of life or intelligence and have more to do with the rarity of the rapid emergence of biological regulation of feedback cycles on planetary surfaces,” he said.
Wet, rocky planets, with the ingredients and energy sources required for life seem to be ubiquitous, however, as physicist Enrico Fermi pointed out in 1950, no signs of surviving extra-terrestrial life have been found.
A plausible solution to Fermi’s paradox, say the researchers, is near universal early extinction, which they have named the Gaian Bottleneck.
“One intriguing prediction of the Gaian Bottleneck model is that the vast majority of fossils in the universe will be from extinct microbial life, not from multicellular species such as dinosaurs or humanoids that take billions of years to evolve,” said Associate Professor Lineweaver.
The Latest on: Gaian Bottleneck
via Google News
The Latest on: Gaian Bottleneck
- Paper proposes we haven’t found aliens because they’re deadon December 27, 2019 at 4:00 pm
They call this the Gaian Bottleneck, and our own solar system is something of an example. Earth, Mars, and Venus might all have played host to life billions of years ago when they were more similar.
- RIP E.T. – Alien Life On Most Exoplanets Dies Youngon September 7, 2018 at 5:53 pm
This is because the earliest habitable conditions may be unstable. In our “Gaian Bottleneck” model, planets need to be inhabited in order to remain habitable. So even if the emergence of life ...
- RIP E.T. – Alien life on most exoplanets dies youngon June 7, 2016 at 9:14 am
Astronomers have found a plethora of planets around nearby stars. And it appears that Earth-sized planets in habitable zones are probably common. More from IBTimes UK Astronaut Chris Hadfield: I ...
- 'If aliens visit Earth, they'll take charge': Seti scientist claimson February 5, 2016 at 1:59 am
The study, published in the journal Astrobiology, said life in the universe may depend on something they call the Gaian bottleneck. This is where life plays a key role in modifying and regulating ...
- Aliens DO exist - but they're EXTINCTon January 24, 2016 at 8:50 am
He said the survival of life on other planets would depend on something called the 'Gaian bottleneck', in which life changes its environment in order to aid evolution - an extremely rare occurence.
- The Aliens Are Silent Because They’re Deadon January 21, 2016 at 11:50 pm
A plausible solution to Fermi’s paradox, say the researchers, is near universal early extinction, which they have named the Gaian Bottleneck. “One intriguing prediction of the Gaian Bottleneck ...
- Australian astrophysicists say most extraterrestrial life is probably already extincton January 21, 2016 at 5:23 pm
They’ve named their “Great Filter” the “Gaian Bottleneck”. Essentially, for life to survive — a planet needs to be thriving with life. At the core of the “Gaian Bottleneck” idea is ...
- Why Can't We Find Aliens? Climate Change Killed Themon January 20, 2016 at 4:00 pm
Chopra and Lineweaver suggest their new research provides some answer to this paradox and call it the "Gaian Bottleneck." If life isn't given a chance to stabilize its biosphere, then it's doomed.
- The Bottleneck Years by H. E. Taylor - Chapter 30on March 5, 2013 at 4:00 pm
"Well that was a surprise," I said. "Who were those women?" "Just some Gaian friends who were worried that I was being taken advantage of." "Oh, I didn't know you were Gaian." "I'm not, but some ...
via Bing News