Extraterrestrial Explorers - Searching for a New Earth
Dec 11, 2010 11:03PM
“If we don’t find any Earths… then we can say, ‘Wow, Earth is really rare. We need to take care of it,’” says Doyle, who is also a principal investigator at the SETI Institute and president of the nonprofit Planet Quest. If the scientists do find another Earth-like planet, the next step would be to search for signs of biological life by checking to see if free oxygen is present in the atmosphere.
Sources: Principia Purpose and NASA.gov