Humans have been searching for aliens for thousands of years, but a new study claims that the search is futile.
Aliens are extinct, according to astrobiologists doing a research on the development of life. They explained in the study that runaway heating or cooling on young planets would have killed any life form.
Dr Aditya Chopra, who works at the ANU Research School of Earth Sciences and lead author of the new study published in Astrobiology, said their study has found the answer to the puzzling mystery why humans haven't found aliens after centuries of searching.
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.
According to the news study, Earth, Venus and Mars could have been habitable four billion years ago. After a billion years or so however, Venus and Mars became uninhabitable. Venus' temperature rose too high while Mars' temperature decreased exponentially, freezing everything on its surface.
As seen on Science Daily, Chopra said life on planets other than Earth likely became extinct.
The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens. 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.
While microbial life on Earth survived, early life form on Venus and Mars, if there had been any, wasn't able to stabilize quickly to adjust in the rapidly changing environment, said Charley Lineweaver, co-author of the study and Associate Professor at the ANU Planetary Science Institute.
The study sounds convincing and it makes me think we are where we are meant to be. Everything happens for a reason and we could be put on Earth because we're not meant to live on any other planet.
Still, the universe is large, and human civilization is young. If there is any alien life out there, it could be that we're just too young to fathom any advanced technology other than ours.
Who knows? Aliens could be looking at us right now and we might not even know it.