About four billion years ago Earth, Venus and Mars may have all been habitable. The research was published in the journal Astrobiology. "Most early planetary environments are unstable," he said. "The Universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens," said Dr Aditya Chopra from the Australian National University Research Sch-ool of Earth Sciences. "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 Lineweaver.
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. A plausible solution to Fermi’s paradox, say the researchers, is near universal early extinction, which they have named the Gaian Bottleneck. "Early life is fragile, so we believe it rarely evolves quickly enough to survive," said Chopra. "The mystery of why we haven’t yet found signs of aliens may have less to heating film Manufacturers do with the likelihood of the origin of life and have more to do with the rarity of the rapid emergence of biological regulation of feedback cycles on planetary surfaces," said associate Professor Charley Lineweaver.The mystery of why we have not found signs of aliens yet may have been solved by scientists, including one of Ind-ian-origin, who suggest life on other planets wou-ld likely be brief and become extinct very quickly.
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