Scenario: infinite you

Humanity has discovered interdimensional travel, other worlds species and versions of themselves so perfect or horrifying that you could not even begin to comprehend this new discovery.

Scenario
this scenario is so far in the future that our solar system is beginning to collapse and the humans must act quickly because within 20 million years the last hope for life in Universe-Q18B will be lost. But then the genius scientist known as Glenn Camara discovers a way to travel between dimensions and discovers that humans are far more insignificant than we ever feared.

The life in that part of the world is more advanced than the human race. The number of human-like creatures and the aliens along with them has amazed the human race. The human race spacecraft ended in the custody of the life forces present there. Though it was called Universe Q18B on Earth it is called the Grah in their own language and this Grah is a gigantic planet surpassing the entire solar system. The discussions the human race offered had pleased the Grah leadership and a dwarf planet was given to the humans to reside on. The gigantic population of almost eighty billion were irreplaceable in that place, with the used old ships borrowed from the planet of Grah which itself is a outpost eventually the humans were accepted into the combat forces and were sent to multiple wars, where un countable number of people has were lost but eventually, the human race traveled in different directions evacuating the falling solar planetary system for its immense mining, where Earth was shifted a few light minutes distance away from the sun to keep in a safe condition.

There is no multiversal government ruled by Earth. Sometimes Earth has been a part of an interdimensional government.