Multiple Choice
How was the black hole candidate Cygnus X-1 first discovered?
A) by extremely high spatial resolution radio observations with the VLA radio interferometric array in New Mexico
B) by high-resolution visible-light observations with the Hubble Space Telescope
C) by X-ray measurements with the Uhuru satellite
D) by infrared observations with the IRAS infrared satellite
Correct Answer:
Verified
Correct Answer:
Verified
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