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presents a picture of the black hole at the center of the galaxy M87.One part of the ring is brighter, because of the so-called relativistic beaming effect: the increased brightness implies that this part of the accretion disk rotates towards us. The M87 black hole is 55 million light year from Earth and is 6.5 million times more massive than the Sun.The light rays are bend so strongly that we see also the part of the accretion disk which should be hidden be- hind the black hole.An accretion disk is created as material falls into a black hole.Of course, depending on the system parameters, there are a plethora of other images that would also be consistent with Einstein's theory of gravity; hence, in this instance, discussing consistency is preferable to providing concrete evidence for the theory.Since the black hole was only observed at a single wave-length of 1.3 mm, the color* gradation relates to brightness rather than wavelengths (colors are fake).

presents a picture of the black hole at the center of the galaxy M87. Since the black hole was only observed at a single wave-length of 1.3 mm, the color* gradation relates to brightness rather than wavelengths (colors are fake). An accretion disk is created as material falls into a black hole. It glows and is hot. Light is bent by gravity and creates a brilliant ring around the black hole's shadowy dark center. In the case of a non-spinning black hole (which, however, this one is spinning), the inner radius of the ring is approximately 2.6 times greater than the event horizon radius. At first sight, it looks like we see the M87 black hole in the direction perpendicular to the disk. This is not true. The light rays are bend so strongly that we see also the part of the accretion disk which should be hidden be- hind the black hole. One part of the ring is brighter, because of the so-called relativistic beaming effect: the increased brightness implies that this part of the accretion disk rotates towards us. The M87 black hole is 55 million light year from Earth and is 6.5 million times more massive than the Sun. About 120 times larger than the distance from Earth to the Sun, or three times larger than the normal distance between Pluto and the Sun, is its event horizon radius. Figure 1's initial representation of the black hole is in line with general relativity. Of course, depending on the system parameters, there are a plethora of other images that would also be consistent with Einstein's theory of gravity; hence, in this instance, discussing consistency is preferable to providing concrete evidence for the theory. However, a number of the image's distinctive characteristics are consistent with general relativity predictions, and its utilization could lead to more accurate estimates of the M87 black hole's parameters (such as mass and size). This image will help us rule out a few unusual black hole substitutes.