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Around one in five Sun-like stars is thought to have an Earth-sized planet in its habitable zone. A 2012 study, analyzing gravitational microlensing data, estimates an average of at least 1.6 bound planets for every star in the Milky Way. On December 20, 2011, the Kepler Space Telescope team reported the discovery of the first Earth-sized extrasolar planets, Kepler-20e and Kepler-20f, orbiting a Sun-like star, Kepler-20. More than two thousand planets around other stars (" extrasolar planets" or "exoplanets") have been discovered in the Milky Way: as of 22 February 2016, 2085 known extrasolar planets in 1331 planetary systems (including 509 multiple planetary systems), ranging in size from just above the size of the Moon to gas giants about twice as large as Jupiter.
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he scientific community, are no longer viewed as such. nd the other planets share characteristics such as volcanism, hurricanes, tectonics, and even hydrology. Six of the planets are orbited by one or more natural satellites. In order of increasing distance from the Sun, they are the four terrestrials, Mercury, Venus, Earth, and Mars, then the four giant planets, Jupiter, Saturn, Uranus, and Neptune. Under IAU definitions, there are eight planets in the Solar System. Planets are generally divided into two main types: large low-density giant planets, and smaller rocky terrestrials. Since the dawn of the Space Age, close observation by space probes has found that Earth a As observational tools improved, astronomers saw that, like Earth, the planets rotated around tilted axes, and some shared such features as ice caps and seasons. 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 firs T trans-Neptunian object discovered), that were once considereuse it excludes many objects of planetary mass based on where or what they orbit. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. These were regarded by many early cultures as divine, or as emissaries of deities. Several planets in the Solar System can be seen with the naked eye. The term planet is ancient, with ties to history, science, mythology, and religion. has cleared its neighbouring region of planetesimals.is not massive enough to cause thermonuclear fusion, and.
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