space anime are sort of hard to come by tbh.
More common are anime involving beings from space which have come to earth or some other planet or people from earth ending up on other worlds or living with aliens on some world: Birdy The Mighty Decode
, Mars Daybreak
, The Third
, anything from the Tenchi
series, etc. I can list more of this type but I don't think it's exactly what you're looking for and pretty soon we'll start crossing into boring mecha titles. :p
As far as actual space anime go, I assume you've probably already seen Cowboy Beebop
is decent, but not great and I heard Legend of the Galactic Heroes
is good but not had a chance to watch it myself. I heard mixed reviews about Tytania
but found it to be fairly boring.