A new theory known as the Gaia Bottleneck holds that life on other planets may with a high probability become extinct shortly after their formation due to accelerated warming or cooling of the planets on which they formed
The universe is probably full of habitable planets, which leads scientists to estimate that they are inhabited by aliens. But life on other planets may be short-lived and die out fairly quickly, say astrobiologists from the Australian National University (ANU).
In a study designed to understand how life might have developed, the scientists estimate that in most cases life becomes extinct shortly after it was created due to rapid changes in climate - the warming or cooling of the planet on which it was created.
CSIRO's Parkes radio telescope will search for extraterrestrial civilizations as part of a groundbreaking $100 million listening project. Photo: Wayne England
"The universe is probably full of habitable planets, which leads scientists to estimate that they are inhabited by aliens." Says Aditya Chopra from the School of Earth Sciences and lead author of the article published in the journal "Astrobiology" "Early life is very fragile, and therefore I believe that it is rare that they evolve fast enough to survive."
"Most early planetary environments are unstable. To develop a habitable planet, life needs to control greenhouse gases such as water and carbon dioxide to keep the surface temperature stable."
"4 billion years ago Earth, Venus and Mars were all habitable. However, about a billion years after their formation, Venus became a furnace and Mars froze.
"Early bacteria on Mars or Venus, if there were any, failed to stabilize the rapidly changing environment," says the second researcher in the study, Charlie Lineweaver of ANU's Institute of Planetary Sciences. "Life on Earth probably played an important role in stabilizing the planet's climate. said.
Dr. Chopra said that their theory solved the puzzle. "The mystery surrounding the question of why we have not discovered signs of extraterrestrials (intelligent aliens a.b.) depends less on the question of the plausibility of the creation of life or intelligence, but more on the rarity of a rapid appearance of biological regulation of a feedback system on the surface of a planet." said.
"Wet and rocky planets that have all the ingredients and energy sources necessary for life seem common. However, as the physicist Enrico Fermi pointed out in the XNUMXs, no signs of the survival of extraterrestrial life have been found."
A likely solution to the Fermi paradox, the researchers say, is that there is an almost universal extinction, which they call "Gaia's bottleneck"
"One of the intriguing predictions of the Gaia bottleneck model is that most of the fossils in the universe will be of extinct bacterial life, not of multicellular creatures like dinosaurs or hominoids that require millions of years of evolution," Linweaver says.
More of the topic in Hayadan:
- Why are there apparently no aliens?
- Review of the film Contact based on Carl Sagan's book
- Hello, is this Bloomfield? Or how we will communicate with intelligent aliens
- The enduring fascination of the Roswell incident is indicative of the way we will respond when real aliens land here
- How do you make contact with other life forms in space?
- Carl Sagan - Knowledge is our destiny, intelligence on Earth and beyond
- What will we do when the aliens arrive?