Generally I think people tend to underestimate how quickly life arose on Earth but underestimate how quickly it took for life to turn into complex life. Just j

Generally I think people tend to underestimate how quickly life arose on Earth but underestimate how quickly it took for life to turn into complex life. Just judging from how things went on Earth we should expect cemosynthetic life to be relatively common but photosynthesis to rarely arise, much less eukaryotic cells or multi-cellular animals. I drew out a timeline comparing how long it took various stages of life to arise on Earth versus how long it took Mars to lose all its surface water. Even on Earth we humans didn't arise until relatively close to when the expanding Sun will render the surface uninhabitable. http://hopefullyintersting.blogspot.com/2019/04/how-likely-is-it-that-there-was-life-on.html http://hopefullyintersting.blogspot.com/2019/04/how-likely-i...