NExSS will help lay the groundwork for answering important questions about how to search for signatures of life on distant worlds using existing technology. (giss.nasa.gov)
Gaia's founding scientist James Lovelock formulated Gaia theory while working for NASA seeking chemical signatures of life on other planets. (landscapesandcycles.net)
Sagan and his colleagues used that to test a key question: Whether spacecraft could detect signatures of life from afar. (sciencedaily.com)