I’m working on a small story, where all the stars in the cosmos have turned into the size of tiny rats and rats have turned into the size of gigantic suns. This happened due to some sort of unknown mutation, not even humans know exactly why this happened.
Years went by, and dead rats the size of suns became a great way of keeping warm: now that suns weren’t as big as they usually were. Man kind are looking to conquer space, after thousands of years living inside giant rats—they decide to build spacecrafts out of these huge rats!
But why on Earth would they wish to build spacecrafts out of rats? I’d really like for it to be part of the story, but I need some reasons as to why they choose to build spacecrafts out of dead gigantic rats rather than gathering the raw materials normally used to make spacecrafts.