OK, this is probably going to be a fairly short thread.
RTE never produced an equivalent of Doctor Who or Blakes 7, successful British sci fi series. They did show B7 but for some reason never picked up the Time Lord.
RTE did produce two live action series aimed at children which seemed to be partially inspired by Doctor Who.
Wanderly Wagon, ran (bar repeats) from 1967 to 1982.
With spinoff show Fortycoats & Co (1983-87) the Doctor Who influence is much more obvious, Fortycoats has a time travelling sweetshop that like the Tardis is bigger on the inside than the outside. He has two younger companions, occasionally went to outer space.
However cant think of an outer space set RTE sci fi show that was aimed at adults, or even, teenagers. Budget constraints obviously had a factor, maybe cultural factors as well.