Planet Wiki - What is the planet?
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Five planets in the Solar System are visible to the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. 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. 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 first trans-Neptunian object discovered), that were once considered planets by the scientific community, are no longer viewed as such. The planets were thought by Ptolemy to orbit Earth in deferent and epicycle motions. 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 observational data collected by Tycho Brahe, Johannes Kepler found the planets' orbits were elliptical rather than circular. As observational tools improved, astronomers saw that, like Earth, each of the planets rotated around an axis tilted with respect to its orbital pole, and some shared such features as ice caps and seasons. Since the dawn of the Space Age, close observation by space probes has found that Earth and the other planets share characteristics such as volcanism, hurricanes, tectonics, and even hydrology. Planets are generally divided into two main types: large low-density giant planets, and smaller rocky terrestrials. There are eight planets in the Solar System. 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. Six of the planets are orbited by one or more natural satellites. Several thousands of planets around other stars ("extrasolar planets" or "exoplanets") have been discovered in the Milky Way. As of 1 January 2019, 3,946 known extrasolar planets in 2,945 planetary systems (including 650 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. in the circumstellar habitable zone. 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. A 2012 study, analyzing gravitational microlensing data, estimates an average of at least 1.6 bound planets for every star in the Milky Way. Around one in five Sun-like stars is thought to have an Earth-sized planet in its habitable zone..
What does the word planet mean? Find synonyms, antonyms and the meaning of the word planet in our free online dictionary! Find words starting with planet and anagrams of planet.
Definitions of "planet"
- In the traditional model of solar systems, a celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves. noun
- A celestial body that orbits the sun, has sufficient mass to assume nearly a round shape, clears out dust and debris from the neighborhood around its orbit, and is not a satellite of another planet. noun
- One of the seven celestial bodies, Mercury, Venus, the moon, the sun, Mars, Jupiter, and Saturn, visible to the naked eye and thought by ancient astronomers to revolve in the heavens about a fixed Earth and among fixed stars. noun
- One of the seven revolving astrological celestial bodies that in conjunction with the stars are believed to influence human affairs and personalities. noun
- A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion. noun
- In phrases such as the planet, this planet, sometimes refers to the Earth. noun
- A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See solar system. noun
- A star, as influencing the fate of a men. noun
- A star other than a fixed star: a star revolving in an orbit. noun
- Same as planeta noun
- a person who follows or serves another noun
- any celestial body (other than comets or satellites) that revolves around a star noun
- (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction noun
The word "planet" in example sentences
In short, no envy, hatred, malice, and all uncharitableness; no vice, or meanness, or cheating, or any of the abominations of the planet Terra, and _we come from that planet_.. [A Honeymoon in Space]
*grumbles sumfin aboat leevin a frozzin planet tu go tu a lava planet* Bye!. [Invisible Tarzan vine - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?]
The word planet comes from the Greek word πλανήτης (planetes) which is derived from the word. [CreationWiki - Recent changes [en]]
Two years ago the International Astronomical Union IAU elected to define the term planet, restricting it to the eight largest bodies orbiting the Sun, and deleting Pluto from the list.. [NASA Watch: Space Science News: September 2008 Archives]
But when the International Astronomical Union created its formal definition of the word planet in 2006 - and demoted Pluto by doing it - there was nothing in the fine print about how the object had formed.. [TIME.com: Top Stories]
Some planetary theorists argued that the term "planet" should only apply to the latter, even if two objects have exactly the same mass.. [TIME.com: Top Stories]
These worlds reflect visible light rather than shining in their own right in visible wavelengths, but why should we restrict the definition of the term planet to just those wavelengths that we can see?. [Astroprof's Page]
Our word planet comes from a Greek verb meaning to wander.. [Jihad Watch]
Change how astronomers define the term planet, eh?. [dispatches from TJICistan]
He said this planet is a "pretty prime candidate" for harboring life.. [Gliese 581g 'Goldilocks' Planet Could Be Just Right For Life?]
Similarly, our planet is our house, and we should maintain it with care, to ensure our happiness and the happiness of our children, of our friends, and of all the sentient beings who share this great dwelling place.. ['My Spiritual Journey,' by The Dalai Lama]
The mean temperature of the planet is about 54 degrees.. [White House report warns of climate change effects]
The mainstream public education system on this planet is authoritarian, discriminatory, built to make life easier for adults and regulators, and seemingly not even designed to make children great.. [21st Century Learning]
At Vandenberg AFB California, the most prime deer hunting on the planet is the shotgun only areas around the Base Flight Line and Missile Complexes.. [i watched a guy on tv last night harvest a deer with his bow and he shot the deer at 60 yards.now if he harvest a deer at 60 yar]
Lovelock, who 40 years ago originated the idea that the planet is a giant, self-regulating organism – the so-called Gaia theory – added that he has little sympathy for the climate scientists caught up in the UEA email scandal.. [Coyote Blog » Blog Archive » Why Politicians Love the Global Warming Issue]
The diversity of life on our planet is astounding.. [Dr. Reese Halter: Mother Nature's Medicine Cabinet]
Planet TranslatesPlanet English to Turkish Translate
i. gezegen, seyyare.i. gezegen, seyyare.