Old enough to remember the times before the fist extraterrestrial planet was detected. The pessimist argument was then that circumstances leading to planetary s

Old enough to remember the times before the fist extraterrestrial planet was detected. The pessimist argument was then that circumstances leading to planetary system formation could be so extremely rare that we could possibly be the only habitable range planet in the galaxy. It turned out since the planets are abundant. Planets being abundant increases the chances of life countlessfold, so there is a reason for cautious optimism.