An object or spacecraft that travels in a circular path around a planet, star, or other celestial body.
From Latin 'orbita' meaning 'wheel track' or 'orbit,' plus English -er suffix meaning 'one that does.' Originally a word for things moving in circular paths, popularized by spacecraft in the 1960s.
NASA's Cassini orbiter spent 13 years circling Saturn, transmitting more data than any other spacecraft—it was essentially a robotic explorer that kept going in circles but never got bored.
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