Life on Earth has been proven 30 years ago in an experiment by Carl Sagan. https://theconversation.com/carl-sagan-detected-life-on-earth-30-years-ago-heres-how-

Life on Earth has been proven 30 years ago in an experiment by Carl Sagan. https://theconversation.com/carl-sagan-detected-life-on-earth-30-years-ago-heres-how-his-experiment-is-helping-us-search-for-alien-species-today-216037 https://theconversation.com/carl-sagan-detected-life-on-eart... Just imagine the technological progress made by space faring creatures in the 30 years since! Well. Not much in our case...