Express: Aliens DO exist - but they're EXTINCT

Aliens DO exist, scientists claimed this week, but the reason we have not yet had any extra-terrestrial contact is because they are already EXTINCT.
Astro-biologists from the Australian National University say that, while there are countless habitable planets in the universe, most aliens will have died out before reaching a stage capable of contact.
Expert Aditya Chopra said in a statement: "The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens.
"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.
"Early life is fragile, so we believe it rarely evolves quickly enough to survive.


http://www.express.co.uk/news/world/637562/Aliens-DO-exist-but-they-re-EXTINCT