Interstellary is an evocative word that conjures up images of space travel and adventure. If you're looking to expand your vocabulary, here are a few synonyms for interstellary that you might find useful: 1. Galactic - This word refers specifically to the Milky Way galaxy and anything that resides within it. 2. Extraterrestrial - This term refers to anything outside of Earth, including organisms, planets, and other celestial bodies. 3. Intergalactic - Similar to interstellary, this word refers to the space between galaxies. 4. Interplanetary - This term specifically refers to the space between planets in our solar system. 5. Cosmological - While not a direct synonym, this word is a more general term that refers to the study of the universe as a whole.