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*wikipic*
(‘sizes’ (not ‘distances’) drawn ‘to scale’)
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*as of ‘17 SEPTEMBER 2023’*
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*THE PLANETS TODAY*
*OFFICAL LINK*
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*8 PLANETS*
(as of ‘1 december 2019’)
*and 4 missing ‘rogue planets’*
(for [12 total planets / 1 star] cosmic ratio)
(1/3 of planets have exited the ‘orbit’ + ‘forge forward’)
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(list based on ‘proximity to ‘sun”) –>
(starting from ‘closest to sun’)
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*from greek πλανήτης*
*alternative form of πλάνης / “wanderer”*
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[a ‘planet’ is a…]
‘celestial body’
(…that is (or was) orbiting a ‘star’ (or ‘stellar remnant’…)
(…IS massive enough to be rounded by its own ‘gravity’…)
(…IS NOT massive enough to cause ‘thermo-nuclear fusion’…)
(…and has ‘cleared’ its ‘neighboring region’ of ‘planetesimals’)
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(the solar system is the ‘gravitationally bound system’ comprising the sun and the objects that orbit it, either ‘directly’ or ‘indirectly’)
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(of those objects that orbit the sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as ‘dwarf planets’ and small solar system bodies)
(of the objects that orbit the ‘sun’ indirectly, the ‘moons’, two are larger than the smallest planet, ‘mercury’)
(the ‘solar system’ formed 4.6 billion years ago from the ‘gravitational collapse’ of a giant ‘interstellar molecular cloud’)
(the vast majority of the system’s mass is in the ‘sun’, with most of the remaining mass contained in ‘jupiter’)
(the four smaller inner planets, ‘mercury’, ‘venus’, ‘earth’ and ‘mars’, are ‘terrestrial planets’, being primarily composed of ‘rock’ and ‘metal’)
(the 4 outer planets are ‘giant planets’, being substantially more massive than the ‘terrestrials’)
(the 2 largest, ‘jupiter’ and ‘saturn’, are ‘gas giants’, being composed mainly of ‘hydrogen’ and ‘helium’; the two outermost planets, ‘uranus’ and ‘neptune’, are ‘ice giants’, being composed mostly of substances with relatively high melting points compared with ‘hydrogen’ and ‘helium’, called ‘ices’, such as ‘water’, ‘ammonia’ and ‘methane’)
(all planets have almost circular orbits that lie within a nearly flat disc called the ‘ecliptic’)
(the ‘solar system’ also contains smaller objects)
(the ‘asteroid belt’, which lies between the orbits of ‘mars’ and ‘jupiter’, mostly contains objects composed, like the ‘terrestrial planets’, of rock and metal)
(beyond neptune’s orbit lie the ‘kuiper belt’ and scattered disc, which are populations of ‘trans-neptunian objects’ composed mostly of ‘ices’, and beyond them a newly discovered population of ‘sednoids’)
(within these populations are several dozen to possibly tens of thousands of objects large enough that they have been rounded by their own gravity)
(such objects are categorized as ‘dwarf planets’)
(identified ‘dwarf planets’ include the asteroid ‘ceres’ and the ‘trans-neptunian’ objects ‘pluto’ and ‘eris’)
(in addition to these 2 regions, various other small-body populations, including ‘comets’, ‘centaurs’ and ‘interplanetary dust’, freely travel between regions)
(six of the planets, at least four of the ‘dwarf planets’, and many of the smaller bodies are orbited by ‘natural satellites’, usually termed “moons” after the ‘moon’)
(each of the ‘outer planets’ is encircled by ‘planetary rings’ of dust and other small objects)
(the ‘solar wind’, a stream of charged particles flowing outwards from the ‘sun’, creates a bubble-like region in the ‘interstellar medium’ known as the ‘heliosphere’)
(the ‘heliopause’ is the point at which pressure from the ‘solar wind’ is equal to the opposing pressure of ‘inter-stellar wind’)
(it extends out to the edge of the scattered disc)
(the ‘oort cloud’, which is thought to be the source for ‘long-period comets’, may also exist at a distance roughly a thousand times further than the ‘heliosphere’)
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(the ‘solar system’ is located in the ‘orion arm’, 26,000 ‘light-years’ from the center of the ‘milky way’)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥