the sun heats it on one side, and not the other, and it rotates. all the asteroids do that. so we have to stop it before we can capture it and bring it back. when the asteroid redirects vehicle approaches, it will deploy this high-tech space bag. then over a period of hours, slowly envelope this asteroid, and then squeeze down with that bag until all the rotation is stopped. this is one theory. then the whole shebang would come flying back toward earth and toward the moon more importantly where the redirect vehicle and encloyded asteroid would go into an orbit up above the lunar surface where astronauts could visit the asteroid and study it. the whole trip from the earth to the cosmos and back to the moon could take several years. not sure how many. maybe four, maybe six, maybe nine, but they re trying to get