You surely don't mean that no other planets could be used to sustain life with technological assistance?
Mars has water, accessible nitrogen (HNO3), carbon (CO2), hydrogen (H2O), oxygen (all of the above)... technologically assisted humans could absolutely inhabit mars.
Also, show me the species on other planets. Far as we know there aren't any and none of the planets seem to be habitable. Stop living in fantasy land.
[1] http://www.atlasobscura.com/articles/new-animal-species