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-as of [26 SEPTEMBER 2024]-
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*wikipic*
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“THE LOCAL INTER-STELLAR CLOUD”
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*THE UNIVERSE IN 3-D*
*”IN THE SKY” LINK*
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-the local bubble is a ‘cavity’ in the ‘inter-stellar medium’ (ISM) in the ‘orion arm’ of the ‘milky way’-
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(it contains, among others, the “local interstellar cloud” and the “G-cloud”)
(the “local interstellar cloud” contains our “solar system”)
(it is at least 300 light years across and has a neutral-hydrogen density of about 0.05 atoms / cm3, or approximately one tenth of the average for the ISM in the ‘milky way’ (0.5 atoms/cm3), and one sixth that of the ‘local interstellar cloud’ (0.3 atoms/cm3))
(the hot diffuse gas in the “local bubble” emits X-rays)
(the very sparse, hot gas of the “local bubble” is the result of supernovae that exploded within the past ten to twenty million years)
(it was once thought that the most likely candidate for the remains of this supernova was ‘geminga’ (“gemini gamma-ray source”), a pulsar in the constellation ‘gemini’)
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(more recently, however, it has been suggested that multiple ‘supernovae’ in ‘subgroup B1’ of the ‘pleiades moving group’ were more likely responsible, becoming a ‘remnant supershell’)
(an inter-stellar cloud is the generic name given to an accumulation of ‘gas’, ‘plasma’, and ‘dust’ in our and other ‘galaxies’)
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(put differently, an ‘interstellar cloud is a denser-than-average region of the interstellar medium)
(depending on the density, size, and temperature of a given cloud, the hydrogen in it can be neutral (H I regions), ionized (H II regions) (i.e. a plasma), or molecular (molecular clouds))
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(‘neutral / ionized clouds’ are sometimes also called “diffuse clouds”)
(while ‘molecular clouds’ are sometimes also referred to as ‘dense clouds’)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥