How did karl jansky contribute to the knowledge of black holes?
he located the first supermassive black hole.
he discovered radio waves coming from space.
he developed a theory of black hole creation.
he invented a telescope to detect radio energy.

Karl Jansky contribute to the knowledge of black holes by inventing a telescope to detect radio energy.

Explanation:

In 1932 the American physicist Karl Jansky first identified inestimable radio clamor from the focal point of the Milky. Karl Guthe Jansky (October 22, 1905 – February 14, 1950) made the revelation of the principal cosmic radio source fortunately in the mid 1930s.

The radio telescope is a galactic instrument comprising of a radio collector and a reception apparatus framework that is utilized to identify radio-recurrence radiation discharged by extraterrestrial sources. He is viewed as one of the establishing figures of radio space science.

1# the answer is c

2#the answer is a