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What is a planet?

What is a planet? Here are some definitions.

Noun
  1. (now historical or astrology) 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. [from 14th c.]
  2. (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.) [from 17th c.]
  3. A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion.
  4. In phrases such as the planet, this planet, sometimes refers to the Earth.
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The brightest planet in the sky will appear as a black dot moving across the surface of the sun.
Modern texts often refer to Uranus as the planet that governs astrology and astrologers.
This makes it the most distant extrasolar planet detected by astronomers to date.
If America spurns global agreements on climate change, the whole planet is more vulnerable.
They ought to beam him down to us, to demonstrate the existence of intelligent civic life on the planet Northern Ireland.
The planet passes Spica at midmonth, moving four degrees north of the star on the 16th.

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