Hello! I am currently working on several short stories all set in the same universe as a novel I will write when they are finished, and I still have plenty of blurry areas in the setting to define. But I don't wanna bore everyone with all of it! So I'll just limit it to a few questions at a time over a very long time I think! So here goes! Question 1: I'm trying to make all of humanity sterile so that they cannot reproduce sexually, and are forced to repopulate via cloning. The current reason for this has to do with the method that humans left earth. The short version is that they "rode" an extremely large, almost planet sized/shaped asteroid/dwarf planet that was moving through the solar system. Earth saw it coming hundreds of years in advance, spent hundreds of years preparing. After the dwarf planet came within a certain range, millions of humans moved to it and "rode" it out of the solar system for several hundred years, until they came within range of a terraformable planet, then used the dwarf planet to "orbit" the new planet while they made it habitable, and eventually moved over to it as their new homeworld. The reason humans are all sterile (as it currently stands) is that what they didn't account for was undiscovered forms of radiation that were encountered during the long journey upon the dwarf planet. Does that reason sound silly? Is there any input you guys can give me? Is there a better way to do this?