astronaut floating through outer space with a vast, starry galaxy in the background. digital artwork representing space

astronaut space galaxy stars exploration cosmic universe futuristic scifi adventure floating cosmos earth nebula digital artwork spacewalk starlit expedition void astral interstellar cosmonaut infinite astro celestial extraterrestrial stellar cosmology planets outerspace spacetravel cosmicjourney galacticadventure spaceexploration universewanderer spaceodyssey milkyway deepspace ai