Definition for Difference between revisions of "Planet"
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(Created page with "Any of the nine large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, o...") |
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| − | Any of the nine large heavenly bodies revolving about the sun and shining by reflected light: [[Mercury]], [[Venus]], [[Earth]], [[Mars]], [[Jupiter]], Saturn, Uranus, Neptune, or Pluto in the order of their proximity to the [[sun]]. | + | 1) Any of the nine large heavenly bodies revolving about the sun and shining by reflected light: [[Mercury]], [[Venus]], [[Earth]], [[Mars]], [[Jupiter]], Saturn, Uranus, Neptune, or Pluto in the order of their proximity to the [[sun]]. |
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| + | 2) A celestial object that orbits a star, is big enough for gravity to have squashed it into a roundish ball and it must have cleared other objects out of the way in its orbital neighborhood. To accomplish the third feat, it must be big enough to pull neighboring objects into the planet itself or to sling-shot them around the planet and off into outer space. Astronomers of the International Astronomical Union (IAU) created this three-part scientific definition of a planet in August 2006 to determine Pluto’s status. Based on that definition, IAU ruled that Pluto did not qualify. The solar system now includes eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. | ||
Latest revision as of 11:47, 16 September 2019
1) Any of the nine large heavenly bodies revolving about the sun and shining by reflected light: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, or Pluto in the order of their proximity to the sun.
2) A celestial object that orbits a star, is big enough for gravity to have squashed it into a roundish ball and it must have cleared other objects out of the way in its orbital neighborhood. To accomplish the third feat, it must be big enough to pull neighboring objects into the planet itself or to sling-shot them around the planet and off into outer space. Astronomers of the International Astronomical Union (IAU) created this three-part scientific definition of a planet in August 2006 to determine Pluto’s status. Based on that definition, IAU ruled that Pluto did not qualify. The solar system now includes eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.