Synonyms for Cosmic steppingstones:

• n.

  •space station (noun)
  • advance base,
  • astro station,
  • manned station,
  • space island,
  • space airport,
  • island base,
  • spaceport station,
  • space platform,
  • spaceport,
  • cosmic stepping-stone.

• Other synonyms:

  •Other relevant words:
  • space laboratory,
  • space station.