Most of the surviving human race has moved to Second Earth, a huge spaceship that orbits the planet.

I thought things would be great by moving back to Earth.

We could move our whole civilization to Earth.

No, instead it's still moving east-west with respect to Earth.

Years later, the residents move back to Earth.

He'd moved to Earth, where one clone is any normal citizen's entire birthright.

More effort had gone into armaments than would have been needed to move the whole Lunarian race to Earth twice over.

That was why our people wanted to move to Earth.

After a failed all-out attack by humans, the Gards-orm moved most of their facilities to Earth.

Perhaps the human race began on Mars and moved to Earth.