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Although the idea that the planets orbited the Sun had been suggested many times, it was not until the 17th century that this view was supported by evidence from the first telescopic astronomical observations, performed by Galileo Galilei.
At about the same time, by careful analysis of pre-telescopic observation data collected by Tycho Brahe, Johannes Kepler found the planets' orbits were not circular but elliptical.
it was almost universally believed that Earth was the center of the Universe and that all the "planets" circled Earth.
Several thousands of planets around other stars ("extrasolar planets" or "exoplanets") have been discovered in the Milky Way.
As of 1 December 2017, 3,710 known extrasolar planets in 2,780 planetary systems (including 621 multiple planetary systems), ranging in size from just above the size of the Moon to gas giants about twice as large as Jupiter have been discovered, out of which more than 100 planets are the same size as Earth, nine of which are at the same relative distance from their star as Earth from the Sun, i.e. The idea of planets has evolved over its history, from the divine lights of antiquity to the earthly objects of the scientific age.
The five classical planets, being visible to the naked eye, have been known since ancient times and have had a significant impact on mythology, religious cosmology, and ancient astronomy.
In ancient times, astronomers noted how certain lights moved across the sky, as opposed to the "fixed stars", which maintained a constant relative position in the sky.
Planets are generally divided into two main types: large low-density giant planets, and smaller rocky terrestrials.
Under IAU definitions, there are eight planets in the Solar System.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.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.The ones that aren't are usually sources of Surreal Humor.Tags: Adult Dating, affair dating, sex dating