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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 neighborhood around its orbit.
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. [1] .
27 cze 2019 · A planet is an object that orbits a star, is big enough to be round, and has cleared away other objects near its orbit. Learn how planets form, what are exoplanets, and why scientists disagree on some cases.
A planet is defined as a celestial body that (a) is in orbit around a star, (b) has enough mass for its gravity to create a round shape, and (c) has cleared its neighborhood of smaller objects.
Learn how the word "planet" evolved from ancient Greek to modern astronomical terms. Find out the criteria and controversies of the IAU definition of a planet and its categories.
29 cze 2015 · Learn about the history and debate of the definition of a planet, from ancient Greeks to modern astronomers. See how the discovery of new objects in the Kuiper Belt challenges the traditional classification of planets.
What is a Planet? The planets in our solar system are shown from top to bottom: Mercury, Venus, Earth (and our moon), Mars, Jupiter, Saturn, Uranus, and Neptune. Image courtesy NASA/JPL.
