Ok, please one more. Henry Schmidt says. I just have to know. Every space craft I've ever seen is metallic, or mostly metallic, with engines that would kill any living thing if they weren't shielded. How can a being, an animal, fly through space with no engine? Animals have metal too. Patricia says. Sodium is a metal. Calcium is a metal. Iron is a metal. Just because most protein compounds burn at low temperatures, don't doubt that there are some that can get red hot and not burn. Don't underestimate what evolution can create.