Etymology
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extraterrestrial (adj.)

also extra-terrestrial, "occurring or originating outside the Earth," 1812, from extra- + terrestrial. As a noun from 1956.

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rover (n.2)

"one who wanders or rambles," especially to a great distance, 1610s, agent noun from rove (v.). Meaning "remote-controlled surface vehicle for extraterrestrial exploration" is from 1970.

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meteorite (n.)

"rock or metallic mass of extraterrestrial origin that falls to earth after streaking across the sky as a meteor," 1818, from meteor + -ite. They were known from ancient times, but the idea that some such iron masses or rocks had fallen to earth from the sky attained credence among scientists c. 1800.

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