interstellarRelating to or situated in the space between stars
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Located, taking place, or traveling among the stars."An interstellar journey involves traveling from one star system to another."
extraterrestrialOut of this world, relating to or originating from beyond Earth.
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Originating, located, or occurring outside Earth or its atmosphere."The search for extraterrestrial life continues as scientists study the universe."
spacecraftA vehicle used for traveling in space
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A vehicle designed for air or space travel outside the earth's atmosphere."The spacecraft successfully orbited the moon before heading back to Earth."
trajectoryThe path followed by an object moving under the action of given forces.
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The path that a moving object follows through space as a function of time."The missile's trajectory was calculated to intercept the incoming projectile."
alienBelonging to a foreign country or nation; a foreigner, especially one who is not a naturalized citizen of the country where they are living.
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Belonging to a foreign country or nation."She felt completely alien in her new school."
A hypothetical or fictional being from another world."In the movie, an alien from Mars tries to destroy Earth."