*LIST OF GALAXIES” –>
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“TYPES OF GALAXIES” –>
*SATELLITE GALAXIES*
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*GALAXY* –>
(‘massive’, ‘gravitationally-bound’ system that consists of…)
*’stars’ + ‘stellar remnants’*
*an ‘inter-stellar medium’ of [‘gas’ / ‘dust’]*
(…and an ‘important’ (but ‘poorly understood’) component tentatively dubbed “dark matter”)
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(the name is from the greek root “galaxias” [γαλαξίας], meaning “milky,” a reference to the ‘milky way galaxy’)
(like “watchung hills”)
(the “milky way galaxy” translates to “milky way milky”)
(typical ‘galaxies’ range from ‘dwarfs’ with as few as ’10 million’ stars up to ‘giants’ with ‘1 trillion’ stars, all orbiting the galaxy’s ‘center of mass’)
(‘galaxies’ may contain many multiple ‘star systems’, ‘star clusters’, and various ‘interstellar clouds’)
(the ‘sun’ is one of the ‘stars’ in the ‘milky way galaxy’; the ‘solar system’ includes the ‘earth’ and all the other ‘objects’ that orbit the ‘sun’)
(historically, ‘galaxies’ have been categorized according to their apparent ‘shape’ (usually referred to as their ‘visual morphology’))
(a common form is the ‘elliptical galaxy’, which has an ‘ellipse-shaped’ light profile)
(‘spiral galaxies’ are ‘disk-shaped assemblages’ with ‘dusty’, ‘curving’ arms)
(‘galaxies’ with ‘irregular’ or ‘unusual’ shapes are known as ‘peculiar galaxies’, and typically result from ‘disruption’ by the ‘gravitational pull’ of neighboring ‘galaxies’)
(such interactions between nearby ‘galaxies’, which may ultimately result in galaxies ‘merging’, may induce episodes of significantly increased ‘star formation’, producing what is called a “starburst galaxy”)
(small galaxies that lack a coherent structure could also be referred to as ‘irregular galaxies’)
(there are probably more than ‘170 billion’ (1.7 × 1011) galaxies in the ‘observable universe’)
(most ‘galaxies’ are 1,000 to 100,000 ‘parsecs’ in ‘diameter’ and are usually separated by distances on the order of ‘millions’ of ‘parsecs’ (or ‘megaparsecs’))
(‘intergalactic space’ (aka the “‘space’ between ‘galaxies'”) is filled with a tenuous ‘gas’ of an average density less than 1 ‘atom’ per ‘cubic meter’)
(the majority of ‘galaxies’ are organized into a ‘hierarchy’ of associations called ‘clusters’, which, in turn, can form larger groups called ‘superclusters’)
(these larger structures are generally arranged into ‘sheets’ and ‘filaments’, which surround ‘immense voids’ in the ‘universe’)
(although it is not yet well understood, ‘dark matter’ appears to account for around 90% of the ‘mass’ of most ‘galaxies’)
(observational data suggests that supermassive black holes may exist at the center of many, if not all, galaxies)
(they are proposed to be the primary cause of active galactic nuclei found at the core of some galaxies)
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(the ‘milky way galaxy’ appears to harbor at least 1 such object within its ‘nucleus’)
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👈👈👈☜*“THE OBSERVABLE UNIVERSE”* ☞ 👉👉👉
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥