Avery E. Broderick, Abraham Loeb
The article discusses attempt by astronomers to produce images of the supermassive black holes that lie at the center of the Milky Way and M87 galaxies, such as Satittarius A* (Sgr A*), through the construction of a network of radio telescopes. Topics include an explanation of event horizons, which is the central feature of a black hole, why astronomers have difficulty viewing black holes directly, such as their extreme gravity, and how better studies could explain black hole phenomena. INSET: DISTANT SIGNS OF BLACK HOLES.
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