How Was the Black Hole Candidate Cygnus X-1 First Discovered

question 79

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

---

Definitions:

Sue

To initiate legal proceedings against a person or entity.

Loan

A sum of money borrowed from a lender that is expected to be paid back with interest.

Materially Altered

Refers to significant modifications made to a document or object that change its original condition or purpose.

Presentment Warranties

are assurances given by a party during the presentation of a negotiable instrument that certain facts are true.