Question

what is planet explain in details.

Answer 1

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
has cleared its neighbouring region of planetesimals.
Mercury Venus
Earth Mars
Jupiter Saturn
Uranus Neptune
The eight planets of the Solar System
The terrestrial planets
Mercury, Venus, Earth, and Mars
The giant planets
Jupiter and Saturn (gas giants)
Uranus and Neptune (ice giants)
Shown in order from the Sun and in true color. Sizes are not to scale.

The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Several planets in the Solar System can be seen with the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit. Although eight of the planetary bodies discovered before 1950 remain "planets" under the modern definition, some celestial bodies, such as Ceres, Pallas, Juno and Vesta (each an object in the solar asteroid belt), and Pluto (the first trans-Neptunian object discovered), that were once considered planets by the scientific community, are no longer viewed as such.

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Answer 2

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 has cleared its neighbouring region of planetesimals.

The eight planets of the Solar System. The terrestrial planets Mercury, Venus, Earth, and Mars. The giant planets Jupiter and Saturn (gas giants) Uranus and Neptune (ice giants).

The idea of planets has evolved over its history, from the divine lights of antiquity to the earthly objects of the scientific age. The concept has expanded to include worlds not only in the Solar System, but in hundreds of other extrasolar systems. The ambiguities inherent in defining planets have led to much scientific controversy.