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Allow us to weigh in on #BlackHoleWeek! 
#NASAWebb will be able to weigh the supermassive black hole at the center of galaxy NGC 4151 by breaking down starlight in a unique way. More: https://go.nasa.gov/2ErzsFp 
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Intense squishing — density — is what creates black holes, but related to density is mass. A black hole’s mass determines how it feeds & affects the surrounding galaxy. Learning about NGC 4151 will improve our understanding of galaxies across the cosmos:https://twitter.com/NASAUniverse/status/1381623153735139333 …
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Note: A black hole cannot create stars, so it also cannot create the correct mass ratio of stars. The number of stars must be creating the black hole mass ratio - and that means there must be something other than a black hole in galaxy centers.
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