[‘dark matter’ is an un-identified type of ‘matter’ distinct from…]
‘dark energy’
‘baryonic matter’
(aka ‘ordinary’ matter)
‘neutrinos’
.
(it comprises approximately 85% of the mass/energy in the “observable universe”)
(as of ‘5 june 2022’)
(it had previously been estimated at ~ 27%)
😕😕
😕😕
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(defined by what it “is not”)
(does not (appear to) inter-act with ‘electro-magnetic radiation’)
(the ‘standard’)
(‘light’ is type of ‘electro-magnetic radiation’)
*CIRCLE JERK ALERT*
no absorption
no reflection
no emission
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(the name refers to the fact that it does not emit or interact with “electromagnetic radiation”, such as “light”, and is thus invisible to the entire “electromagnetic spectrum”)
(although “dark matter” has not been directly observed, its existence and properties are inferred from its “gravitational effects” such as the motions of “visible matter”, “gravitational lensing”, its influence on the universe’s large-scale structure, and its effects in the “cosmic microwave background”)
(“dark matter” is transparent to “electromagnetic radiation” and/or is so dense and small that it fails to absorb or emit enough radiation to be detectable with current imaging technology)
(it may be decaying)
(estimates of masses for galaxies and larger structures via “dynamical” and “general relativistic” means are much greater than those based on the mass of the visible “luminous” matter)
(the “standard model of cosmology” indicates that the total “mass–energy” of the universe contains 4.9% “ordinary matter”, 26.8% “dark matter” and 68.3% “dark energy”)
(thus, “dark matter” constitutes 84.5% of total mass, while “dark energy” plus “dark matter” constitute 95.1% of total “mass–energy content”)
(the great majority of “ordinary matter” in the universe is also unseen, since visible stars and gas inside galaxies and clusters account for less than 10% of the ordinary matter contribution to the “mass-energy density” of the universe)
(the “dark matter hypothesis” plays a central role in current modeling of cosmic structure formation and galaxy formation and evolution and on explanations of the “anisotropies” observed in the “cosmic microwave background” (CMB))
(all these lines of evidence suggest that “galaxies”, “galaxy clusters”, and the “universe” as a whole contain far more matter than that which is observable via “electromagnetic signals”)
(the most widely accepted hypothesis on the form for “dark matter” is that it is composed of “weakly interacting massive particles” (WIMPs) that interact only through gravity and the “weak force”)
(although the existence of “dark matter” is generally accepted by most of the astronomical community, a minority of astronomers argue for various modifications of the standard laws of general relativity, such as “MOND”, “TeVeS”, and “conformal gravity” that attempt to account for the observations without invoking additional matter)
(many experiments to detect proposed “dark matter” particles through non-gravitational means are under way)
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(on ’25 august 2016′, astronomers reported that “dragonfly 44”, an ‘ultra diffuse galaxy’ (UDG) with the mass of the “milky way galaxy”, but with nearly no discernable ‘stars’ or ‘galactic structure’, may be made almost entirely of “dark matter”)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥🔥