I read Project Hail Mary and I remembered something: If gravity and atmosphere can affect different species for diferrent planets (E.g. Rocky can't survive Grace's ship bc of oxygen and Grace can't handle survie Rocky's atmosphere bc of ammonia and heavier gravity) And even when they recreate the amount of oxygen Grace requires when he starts living on Erid, the gravity is much heavier, thus accelerating the physical aging on his body. I'm bringing this up bc I am suddenly reminded of Clark and Kara—the inhabitants of Krypton. How do their bodies developed and how was affected Since no planet (as far as we know) has similar gravity or atmosphere as Earth, I am questioning the anatomy of Krypton and Kryptonians. I'm under assumption that they follow evolution. Krypton must've had a certain gravity that was heavy that they can handle the gravitational pull of Earth yet light enough for them to develop an ability of flight. And as for atmosphere, does that mean Krypton has a certain amount of oxygen and nitrogen for them to live on Earth without needing special gear. Anyways, that's all I've rambled rn. Feel free to drop ideas and headcanons.
