extreme environments are places human can’t survive in like desserts oceans and space the reason you can’t live or survive is that theirs no natural resources like water and food and it might be really hot or really cold but space has so many ways why you couldn’t live there that’s why i choose it .In space there no oxygen so you won’t survive theirs a lot of planets but some take centuries or years or ten years to get to a planet and if you don’t have water or food you would be dehydrated or starve.In the whole univers there so many things we don’t know like is there other creatures or is there other planets we haven’t explored