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What is a “Planet”?. Originally: “planet” = “wanderer” (Greek root) refers to apparent motion of planets in sky among stars Earth-based; no astrophysical utility How are planets distinct from: moons, asteroids, brown dwarfs, stars ?. The “Cultural” definition of “planet”.
13 Απρ 2010 · - The document discusses the history of planetary classification and discovery in our solar system. It describes how ancient cultures knew of 5 planets and how more were discovered over time, growing the solar system to 8 planets.
12 Απρ 2012 · The document describes the 8 planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) and provides key details about each planet's average distance from the sun, temperature, diameter, composition, atmospheric makeup, number of moons and rings, length of day and year, and surface features.
6 Φεβ 2017 · What is Culture? This document defines culture and its key elements. Culture refers to the knowledge, beliefs, arts, customs, and habits that are acquired by people as members of a society, according to two definitions. It discusses the types of material and non-material culture.
Planets have historically had religious associations: multiple cultures identified celestial bodies with gods, and these connections with mythology and folklore persist in the schemes for naming newly discovered Solar System bodies. Earth itself was recognized as a planet when heliocentrism supplanted geocentrism during the 16th and 17th centuries.
The solar system includes the Sun, planets and their satellites, asteroids, and comets.
The definition of a planet adopted by the IAU says a planet must do three things: It must orbit a star (in our cosmic neighborhood, the Sun ). It must be big enough to have enough gravity to force it into a spherical shape.
