When you travel up to space it has a negative effect on us humans. As there is no gravity in space when you return to Earth where there is gravity it is a lot harder to walk as your not used to all of the pressure. Also people did an experiment where they sent up 1 of 2 identical twins and when he returned back he had a change in his jeans. This shows that is could be dangerous if we were to live in space as there could be no other planets that have gravity and if the earth were to get destroyed then how would we live in space.
In the comments I want you to come up with a solution so this problem by coming up with an invention that might be a space suit etc.