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Synonym of 宇宙人 (uchūjin, “alien”) (life form of non-Earth origin)
Have you heard the news that aliens came to Earth?
invasion; raid; attack; visitation (of a calamity)
We strengthened our defense system in preparation for the alien invasion.
Aliens invaded the Earth.
(astronomy, mythology) Earth; Terra
Earth is one of the planets in the solar system.
an Earthling; a Terran
I am an Earthling.
extraterrestrial area
We are searching for extraterrestrial life.
terraforming (planetary engineering)
The process of terraforming is part of transforming other planets into a habitable environment for humans.
earth science
Earth science is an important field of study for unraveling the mysteries of nature.
global warming
Global warming is a big issue that affects all of us.
(geology, physics) geophysics
He is an expert in geophysics.
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