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Planets aus Wikipedia. Zum Beitrag

Planet - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:5:f2a9127573a22335c2a9102b208c73e7 */ Planet From Wikipedia, the free encyclopedia   (Redirected from Planets) Jump to: , This article is about the astronomical object. For other uses, see Planet (disambiguation). Planetary-sized objects to scale: Top row: Uranus and Neptune; second row: Earth, white dwarf star Sirius B, Venus; bottom row (reproduced and enlarged in lower image) ? above: Mars and Mercury; below: the Moon, dwarf planets Pluto and Haumea. A planet (from The term planet is ancient, with ties to history, science, mythology, and religion. The planets were originally seen by many early cultures as divine, or as emissaries of the gods. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union officially adopted a resolution defining planets within the Solar System. This definition has been both praised and criticized, and remains disputed by some scientists. The planets were thought by Ptolemy to orbit the Earth in deferent and epicycle motions. Though 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. By careful analysis of the observation data, Johannes Kepler found the planets' orbits to be not circular, but elliptic... mehr

Planets aus Wikipedia. Zum Beitrag