One object that is believed to be a black hole in our Galaxy is
A) the central star in the Ring Nebula in Lyra.
B) the central star in the Crab Nebula.
C) the undetected tenth planet in our solar system,whose presence has been inferred from its gravitational influence on the outer planets.
D) Cygnus X-1,a powerful X-ray source.
Correct Answer:
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