For Erid, it’s 100 percent. Radiation just doesn’t get to the ground. Light doesn’t even get to the ground—that’s why they never evolved eyes. The surface is pitch-dark. How does a biosphere exist in total darkness? I haven’t asked Rocky how that works yet, but there is plenty of life deep in Earth’s oceans where the sun doesn’t shine. So it’s definitely doable. Eridians are extremely susceptible to radiation, and they never even knew it existed. The next conversation took another hour and added a few dozen more words to the vocabulary.
