Earth Exodus

The Earth Exodus is the historical event beginning in 2578 AD which saw the human race leave Earth in order to inhabit various planets in galaxies near the Milky Way.

Causes of the emigration
By the year 2500 ca. the human race had polluted the planet to the point where not only the process was irreversible, but life on the planet was no longer bearable. In order to survive, humans had no choice but to abandon Earth and venture into space.

The Hebourakz
Despite their efforts, human technology was not yet ready for long distance travels in outer space. However, in 2576 AD a race alien to humans made contact, offering the entire population of Earth safe passage to a suitable planet. The Hebourakz, this the name of the species, had been looking for a species compatible with their genetic structure in order to repopulate their planet after a natural catastrophe had decimated the population. After much negotiation, the human government agreed to move its citizens to Hebourweet, the planet of the Hebourakz. They did not, however, communicate the reasons for this decision to the human race, hoping that they would naturally form alliances with the Hebouakz, seen as the two species are similar in appearance. The experiment worked, and many human-Hebouakz couples formed throughout the humans stay on the planet. When most of the population moved to other planets, some elected to stay behind. The half human half Hebourakz now constitute most of the population of Hebourweet.