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.

in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )

yes yes it does !