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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
originally posted by: intrptr
As far as extraterrestrial life, how you think life got here?
We are extraterrestrials.
Do the Nordics, Pleaidians, Dracos, Greys, etc. know they are dead?
originally posted by: Soylent Green Is People
While other intelligent life almost surely exists somewhere else in the universe just due to the shear size of the universe, I do think that life that exists "right now" may be rare, and may not really be close enough to us for us to have an occasion to find them (or them find us).
Let's consider just our part of our galaxy -- let's say our quarter of it, or our "quadrant" of it, in Star Trek terms. Sure -- there may be thousands and thousands of places in our quadrant where life had a good chance to emerge. Maybe some life did emerge, and went on to become intelligent and technological.
However, "Time" is also a factor here. Maybe one of those civilizations emerged 200 million years ago (a very short time in cosmological terms, but a long time for biology). It could have flourished for 2 million years (again, a long time for biology as we know it) and then died out. Then another might have come along elsewhere, and then eventually died out...
...There could have been several hundred technological civilizations just in our quadrant of the galaxy that lived and died in the cosmologically short span of the past 200 million years, but maybe there are none, or maybe only one or two, that are around today.
That could be why we haven't had an occasion to meet them. The possible time frame during which they existed and died out is just too large.