Antonyms for extraterrestrial
ˌɛk strə təˈrɛs tri əlex·trater·res·tri·al

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1. extraterrestrial being, extraterrestrial, alienadjective

   a form of life assumed to exist outside the Earth or its atmosphere

   Synonyms:
   unknown, stranger, alien, noncitizen, outlander, extraterrestrial being, foreigner

2. extraterrestrialadjective

   originating or located or occurring outside Earth or its atmosphere

   "is there extraterrestrial life?"

How to use extraterrestrial in a sentence?

1. Baptiste Journaux:

   These are the only planetary bodies, other than Earth, where liquid water is stable at geological timescales, which is crucial for the emergence and development of life, they are, in my opinion, the best place in our solar system to discover extraterrestrial life, so we need to study their exotic oceans and interiors to better understand how they formed, evolved and can retain liquid water in cold regions of the solar system, so far away from the sun.

2. Frans Snik:

   Maybe our first detection of extraterrestrial life will be in our backyard.

3. Gustavo Cruz:

   If extraterrestrial life looks at us, they will not find a [single] technosignature.

4. Christopher Conselice:

   Our new research suggests that searches for extraterrestrial intelligent civilizations not only reveals the existence of how life forms, but also gives us clues for how long our own civilization will last, if we find that intelligent life is common then this would reveal that our civilization could exist for much longer than a few hundred years, alternatively if we find that there are no active civilizations in our Galaxy it is a bad sign for our own long-term existence. By searching for extraterrestrial intelligent life — even if we find nothing — we are discovering our own future and fate.

5. Philipp Heck:

   This meteorite is special because it fell onto a frozen lake and was recovered quickly. It was very pristine. We could see the minerals weren't much altered and later found that it contained a rich inventory of extraterrestrial organic compounds, these kinds of organic compounds were likely delivered to the early Earth by meteorites and might have contributed to the ingredients of life.

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