Try this one...
After they Gave the Sky Back
In the year 2021, the sky disappeared. Up above, replacing the Sun. Moon. and Stars, are scaffolding and lights about three thousand miles above the Earth, well give or take a few miles. The crew of the
ISS was brought to the UN by Aliens. The crew announced that, due to an interstellar war, the local sector authorities decided to relocate potentially endangered "primitives" (that's us).
It's explained that a slow time envelope was being placed around the Earth. They plan to give the Earth a new moon when we get to our new star system.
In what the people of Earth called the year 2037, suddenly the sky was back. The new Moon called Phoebe(one of Selene's titles) by astronomers was blue. It was larger than Mars and had oceans. The next planet out from Earth is a gas giant (named Indra) with several habitable moons.
A new age of exploration has begun.
Basically, Golden Age Sci-Fi in a recognizable 21st century. The Aliens seem to be gone, but how could you tell?
Note: As written, the Aliens during the
Pleistocene brought samples of Earth life and, after terraforming the planets and moons of this star system suitable for such treatment, they released the Earth lifeforms into these environments. The life forms included human tribes. In the intervening millennia, these lifeforms have adapted to their new homes.