Spaceredit

From Asimov

The group of modified humans known as Spacersare the descendants of the first wave of colonists that left Earth. The term Spacer is very general and is primarily used by the people of Earth in a derogatory manner. Spacers prefer to refer to themselves by their planet of origin; that is, Auroran, Solarian, etc.

Each planet has a different culture; in some cases, the cultures are radically different. There are only a few traits that Spacers share in common. First, they have decidedly more advanced technology than the Earth humans. Second, they use robots to an incredible extent, due to the low population on their worlds. Third, Spacers have exceedingly weak immune systems, since there are no pathogens on their planets. The known Spacer planets (or at least the most commonly referred to) are: Aurora, Solaria, Melpomenia, Inferno

It's interesting to note that in the time of the Galactic Empire the epithet "Son of a Spacer" is used in reference to them.