Carl Sagan detected life on Earth 30 years ago – here’s how his experiment is helping us search for alien species today
Carl Sagan detected life on Earth 30 years ago – here’s how his experiment is helping us search for alien species today: Earth and Moon as seen by the Galileo spacecraft from a distance of 6 million km away. NASA It’s been 30 years since a group of scientists led by Carl Sagan found evidence …