Space whales

There’s also the question of how these features would evolve a capacity to deal with the effects of the vacuums, radiation, utter cold, and otherwise, inhospitable nature of space. It’s the same reason why there isn’t an animal or organism capable of surviving being submerged in lava; you can adapt to extreme heat, but lava is such a jump in temperature, and there is so little incentive in magma-tolerance, that there is no organism which has taken “the leap”.

Similarly, space is so cold and inhospitable, and so barren of immediate advantages for an organism, that no organism could possibly deal with the entry-barrier of even getting to a point of tolerating the vacuum of space in the first place. Even water bears for all of their resilience can only survive short-term exposure to space (32% of water bears exposed to space died after 10 days), and even then, those who survived only did so because they went dormant.

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