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For the first two targets of the Event Horizon Telescope, astronomers selected Sag A* in the Milky Way, and the central black hole in galaxy M87. Why did astronomers choose these two distant candidates, when we know of black holes far closer to Earth? Select one: O a. Because the black holes closer to Earth are shrouded in galactic dust, and the radio waves used to observe them are strongly absorbed. O b. Because these distant black holes are so massive, and even at great distances, the angular size of their event horizons appears larger. c. Because nearby black holes are almost always in binary systems, and this makes the radio light from these systems impossible to observe. d. Because only supermassive black holes are massive enough to have a true event horizon.

For the first two targets of the Event Horizon Telescope, astronomers selected Sag A* in the Milky Way, and the central black hole in galaxy M87. Why did astronomers choose these two distant candidates, when we know of black holes far closer to Earth? Select one: O a. Because the black holes closer to Earth are shrouded in galactic dust, and the radio waves used to observe them are strongly absorbed. O b. Because these distant black holes are so massive, and even at great distances, the angular size of their event horizons appears larger. c. Because nearby black holes are almost always in binary systems, and this makes the radio light from these systems impossible to observe. d. Because only supermassive black holes are massive enough to have a true event horizon.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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For the first two targets of the Event Horizon Telescope, astronomers selected Sag A* in the Milky Way, and the central black hole in galaxy M87. Why did astronomers choose these two distant candidates, when we know of black holes far closer to Earth? Select one: а. Because the black holes closer to Earth are shrouded in galactic dust, and the radio waves used to observe them are strongly absorbed. O b. Because these distant black holes are so massive, and even at great distances, the angular size of their event horizons appears larger. С. Because nearby black holes are almost always in binary systems, and this makes the radio light from these systems impossible to observe. O d. Because only supermassive black holes are massive enough to have a true event horizon.
Transcribed Image Text:For the first two targets of the Event Horizon Telescope, astronomers selected Sag A* in the Milky Way, and the central black hole in galaxy M87. Why did astronomers choose these two distant candidates, when we know of black holes far closer to Earth? Select one: а. Because the black holes closer to Earth are shrouded in galactic dust, and the radio waves used to observe them are strongly absorbed. O b. Because these distant black holes are so massive, and even at great distances, the angular size of their event horizons appears larger. С. Because nearby black holes are almost always in binary systems, and this makes the radio light from these systems impossible to observe. O d. Because only supermassive black holes are massive enough to have a true event horizon.
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