Unveiling the first-ever image of a black hole [video]
Good video that correctly predicted the image and describes why it looks the way it does [1].TL; DR The dark area is the entire surface of the event horizon, including the side facing away from us, plus some more due to photons missing the event horizon "directly" being drawn in. One side is brighter due to its being Doppler boosted.[1] https://www.youtube.com/watch?v=zUyH3XhpLTo