The Millimeter-Wave Interferometer (a.k.a., the Event Horizon Telescope) Collaboration. See, e.g., Kim et al., (2019), Doeleman et al., (2019),which show the time evolution of the millimeter wave signature of the ring of plasma around the massive black hole in M87

The Millimeter-Wave Interferometer (a.k.a., the Event Horizon Telescope) Collaboration. See, e.g., Kim et al., (2019), Doeleman et al., (2019),which show the time evolution of the millimeter wave signature of the ring of plasma around the massive black hole in M87

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... data in Figure 5 show the results of the The Millimeter-Wave Interferometer (a.k.a., the Event Horizon Telescope) Collaboration taken in 2017 and published by Kim et al. (2019). The ring of light shown in the image is supposed to be produced by plasma that is swirling around the black hole. ...