What criteria's define a heavenly body to a planet?!
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Answers
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
Answer:
The International Astronomical Union (IAU), the official scientific body for astronomical nomenclature, this year defined "planet" as a celestial body that:[1][2]
(a) is in orbit around a star or stellar remnants;
(b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape;
(c) is not massive enough to initiate thermonuclear fusion of deuterium in its core; and,
(d) has cleared the neighbourhood around its orbit.
Under this definition, the solar system is considered to have eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Three bodies which fulfill the first three conditions but not the fourth are now classified as dwarf planets: Ceres, Pluto and 2003 UB313.
Before the adoption of a recent resolution, there was no scientifically specified definition of "planet", although various notable astronomers had made proposals as part of the ongoing debate. Without a definition, the solar system had been traditionally seen as having various numbers of accepted planets over the years, being seven (the Sun, the Moon, and Mercury through Saturn but not Earth), six (Mercury through Saturn, including Earth), seven again (with Uranus), eleven (with Ceres, Pallas, Juno and Vesta), eight (with Neptune but without the asteroids), and, most recently, nine (with Pluto). It remains to be seen whether the new definition of eight planets will become universally accepted both within the astronomical community, where there has been considerable opposition to the recent adoption, and in the eyes of the greater public.
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