Carl Sagan detected life on Earth 30 years ago – here’s how his experiment is helping us search for alien species today
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It's been 30 years since a group of scientists led by Carl Sagan found evidence for life on Earth using data from instruments on board the Nasa Galileo robotic spacecraft. Yes, you read that correctly.Among his many pearls of wisdom, Sagan was famous for saying that science is more than a body of knowledge – it is a way of thinking. In other words, how humans go about the business of discovering new knowledge is at least as important as the knowledge itself. In this vein, the study was an example of a “control experiment” – a critical part of the scientific method. This can involve asking whether a given study or method of analysis is capable of finding evidence for something we already know. We are now on WhatsApp. Click to join.Suppose one were to fly past Earth in an alien sp...