Multi-Species Space

Rational species can share a planetary system. Human beings sell Jupiter to Ymir and allow other extrasolars to colonize Mars.

They can also share a planet. Because Avalon was jointly colonized, it is jointly ruled by Parliament and Khruath. Because the human colony planet Dennitza accepted Merseian immigrants, the latter race has a House in the Parliament but also organizes its own communities in Vachs and in some places there is an unprecedented degree of intimacy between members of the two species.

See this earlier post on Dennitza.