extraterrestrial

Coming from or existing beyond Earth.

Often used with life, intelligence, or organisms. As a noun, an extraterrestrial is a being from beyond Earth.

• The telescope has not found convincing evidence of extraterrestrial life yet.
• The signal could have an extraterrestrial source, but the data are still inconclusive.
• Extremophiles on Earth help scientists identify conditions that might support extraterrestrial organisms.