That was my first thought, too. My ideas was to make the plastic UV-curable so it would become rigid and not require inflation. I looked it up, and that's wha

That was my first thought, too. My ideas was to make the plastic UV-curable so it would become rigid and not require inflation. I looked it up, and that's what they're doing - UV-curable ribs. It's also not a sphere; it has an inflatable ring. Pictures & paper here: https://asteroid.arizona.edu/KABAND_Inflatable_v3_public.pdf https://asteroid.arizona.edu/KABAND_Inflatable_v3_public.pdf