When the Nordic space aliens needed a new home, they looked everywhere.
Some of them even came to Earth.
What they wound up doing was terriformong planets.
They terriformed Era and Tygetta, and maybe some others.
All through the Milky Way Galaxy, all the habitable homes are taken; someone already lives there.
Right now there are space aliens in this Galaxy, living in spacecraft, because there is no place else.
Don't ever give up the Earth, it's a great planet, in a great location.