different planet; another planet; alien world
Refers to a planet other than Earth, often in science fiction or speculative contexts. Commonly used in compounds like 異星人 (alien being).
He painted a picture imagining the landscape of an alien planet.
In science fiction novels, civilizations from other planets often appear.
alien; extraterrestrial
Compound of 異 (different, unusual) and 星 (star, planet). The exact historical derivation is uncertain, but the word follows a common Sino-Japanese pattern for forming abstract concepts.