Koontz at Massive Science, on NASA’s Darwin-only definition of life: “For instance, say we find a planet full of aliens who have achieved immortality. The population has been stable for thousands of years, with nobody being born and nobody dying — in other words, there is no self-replication going on. There is no variation. Everything is static. There’s no evolution. Would this alien species be considered living under our current definition?”
Davies, author of The Demon in the Machine: How Hidden Webs of Information Are Finally Solving the Mystery of Life thinks we overlook the difficulty and offers a solution: Nature got there first.