Tags Dr. Dirk Schulze-Makuch The Cosmic Zoo, evolution of complex life planetary protection how life can originate a single water droplet for life advanced life animal life intelligent life compared to advanced life Exoplanets Titan telescopes Mars space settlement cloud cities on Venus sample return missions cross contamination planetary protection costs private sector Mars and other human missions liquid water oceans methanol oceans Europa Enceladus the Moon sentient life Fermi Paradox intelligent dinosaurs public interest in searching for life off Earth astrobiology single cell life molecules in space extraterrestrial microbial life one technological species interstellar flight Breakthrough programs Guest Dr. Dirk Schulze-Makuch Tagline "The Cosmic Zoo" and more View the discussion thread.