Things like star and galaxy formation/interactions are (relatively) straightforward, with fairly simple processes/mechanics at the heart of it. It's easier to p

Things like star and galaxy formation/interactions are (relatively) straightforward, with fairly simple processes/mechanics at the heart of it. It's easier to predict on such a large-scale what's going to happen. Things are far more complex on a biological level, which makes it harder to make generalized predictions. I see no reason to infer that life would only consistently evolve into organic life as we know it.