Is The Universe Just One Mass Graveyard?
Although roughly 8.8 billion habitable, Earth-size planets exist in our galaxy, we have yet to discover any other trace of extra terrestrial beings and a new study suggests that that is because they have all since died.
Co-authors Aditya Chopra and Charley Lineweaver of the Australian National University based their study on the assumption they had barely had time to evolve stating “We argue that early extinction could be the cosmic default for life in the universe,” and even go so far as to speculate that they never lived long enough to evolve into multi cellular beings, let alone pilot a space ship.
In their study published in the journal Astrobiology, they state “Even if life does emerge on a planet, it rarely evolves quickly enough to regulate greenhouse gases, and thereby keep surface temperatures compatible with liquid water and habitability. Maintaining life on an initially wet rocky planet in the habitable zone may be like trying to ride a wild bull. Most riders fall off.”
Although some theoretical models do support this theory, the researchers claim they’re more interested in encouraging scientists to update efforts to make first contact, and profess that “there’s no guarantee that we’re on the right track, or even that a planets’ distance from its local star matters in the greater scheme.”
“Planetary habitability is a property more associated with an unusually rapid evolution of biological regulation of surface volatiles than with the luminosity and distance to the host star” the authors conclude.