Planet Xn.

Brit.

/ˌplanᵻt ˈɛks/, U.S.

/ˌplænət ˈɛks/

Forms: also with lower-case initial(s).

Origin: Formed within English, by compounding. Etymons: planet n., X n.

Etymology: < planet n. + X n. (see sense 3 at that entry).

Astronomy.

A hypothetical undiscovered planet in the solar system, whose supposed orbit lies beyond that of the outermost planet known; (originally) that identified as the ninth planet and named Pluto; (later) a hypothetical planet or planets beyond Pluto. Also (esp. Science Fiction): (an arbitrary designation for) an unknown or hypothetical alien planet.

ΚΠ

1882 A. R. Wilkie Rosa xvii. 130 Planet X, that huge and glorious constellation sweeping in the circuit of infinite space, will be realized to be the future home of the children of men.

1907 Trans. 3rd Ann. Congress Federation European Sect. Theosoph. Soc. iv. 299 The principle that each large planet of the Neptune-Jupiter series (Asteroids beyond Neptune, Neptune, Uranus, Saturn, Jupiter, and Planet X (or future)) is formed by six small ones.

1930 Times 15 Mar. 12/7 The distance of ‘planet X’ from the sun has been estimated at Flagstaff as 45 times the distance of the earth from the sun.

1976 J. L. Christian Extra-Terrestrial Intelligence 202 We can only speculate about knowledge on Planet X if we speculate on the general way its inhabitants live and relate.

1978 J. M. Pasachoff & M. L. Kutner University Astron. xx. 511 One recent prediction of ‘Planet X’ was based on the study of orbits of comets, and a mass and orbit for a perturbing planet were deduced.

1991 J. Varley Steel Beach (1993) 259 The scrambler denatured her voice, made her sound like a creepoid from Planet X.

2001 Wired Apr. 122/3 Besides Mars, [Percival] Lowell's other celestial obsession was the mysterious body he came to call Planet X. In 1902 Lowell predicted the existence of a ninth planet beyond Neptune, based on perceived irregularities in the orbits of Uranus and Neptune.

This is a new entry (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	planet x
释义	Planet Xn. Brit. /ˌplanᵻt ˈɛks/, U.S. /ˌplænət ˈɛks/ Forms: also with lower-case initial(s). Origin: Formed within English, by compounding. Etymons: planet n., X n. Etymology: < planet n. + X n. (see sense 3 at that entry). Astronomy. A hypothetical undiscovered planet in the solar system, whose supposed orbit lies beyond that of the outermost planet known; (originally) that identified as the ninth planet and named Pluto; (later) a hypothetical planet or planets beyond Pluto. Also (esp. Science Fiction): (an arbitrary designation for) an unknown or hypothetical alien planet. ΚΠ 1882 A. R. Wilkie Rosa xvii. 130 Planet X, that huge and glorious constellation sweeping in the circuit of infinite space, will be realized to be the future home of the children of men. 1907 Trans. 3rd Ann. Congress Federation European Sect. Theosoph. Soc. iv. 299 The principle that each large planet of the Neptune-Jupiter series (Asteroids beyond Neptune, Neptune, Uranus, Saturn, Jupiter, and Planet X (or future)) is formed by six small ones. 1930 Times 15 Mar. 12/7 The distance of ‘planet X’ from the sun has been estimated at Flagstaff as 45 times the distance of the earth from the sun. 1976 J. L. Christian Extra-Terrestrial Intelligence 202 We can only speculate about knowledge on Planet X if we speculate on the general way its inhabitants live and relate. 1978 J. M. Pasachoff & M. L. Kutner University Astron. xx. 511 One recent prediction of ‘Planet X’ was based on the study of orbits of comets, and a mass and orbit for a perturbing planet were deduced. 1991 J. Varley Steel Beach (1993) 259 The scrambler denatured her voice, made her sound like a creepoid from Planet X. 2001 Wired Apr. 122/3 Besides Mars, [Percival] Lowell's other celestial obsession was the mysterious body he came to call Planet X. In 1902 Lowell predicted the existence of a ninth planet beyond Neptune, based on perceived irregularities in the orbits of Uranus and Neptune. This is a new entry (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1882
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