>>608765Do you want something that looks like Iria Zeiram or scifi in general?
On this chart, the clearly scifi anime from the 90s are
Trigun
Outlaw Star
Cowbow Bebop
Yokohama Kaidashi Kikou
Big O (not 100% sure though)
Neon Genesis Evangelion
Mobile Suit Gundam The 08th MS Team
Irresponsible Captain Tylor
Martian Successor Nadesico
Infinite Ryvius
Crest of the Stars
Ghost in the Shell
Jin Roh The Wolf Brigade
Serial Experiments Lain
Memories
I haven't seen all of them, so I can't confirm their quality.
If you want space stuff where the space travel is casual and easy and not too serious, Outlaw Star and Cowboy Bebop fit, but you can also consider Soreyuke! Uchuu Senkan Yamamoto Yohko.