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Exoplanet vs. Planet

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Exoplanetnoun

A planet which exists outside Earth's solar system.

Planetnoun

Each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn.

Exoplanet

An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not recognized as such.

Planetnoun

(astronomy) A body which orbits the Sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid) and to dominate its orbit; specifically, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until 2006 and has now been reclassified as a dwarf planet.)

Planetnoun

A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion.

Planetnoun

In phrases such as the planet, this planet, sometimes refers to the Earth.

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Planetnoun

A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See Solar system.

Planetnoun

A star, as influencing the fate of a men.

‘There's some ill planet reigns.’;

Planetnoun

any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system

Planetnoun

a person who follows or serves another

Planetnoun

a celestial body moving in an elliptical orbit round a star.

Planetnoun

the earth

‘no generation has the right to pollute the planet’;

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Planetnoun

a celestial body distinguished from the fixed stars by having an apparent motion of its own (including the moon and sun), especially with reference to its supposed influence on people and events

‘the planets are presently influencing you in a positive way’;

Planet

A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and – according to the International Astronomical Union but not all planetary scientists – has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Apart from Earth itself, five planets in the Solar System are often visible to the naked eye.

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