In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Jansky's discovery, a radio engineer named Grote Reber decided to investigate. —A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano

Which type of relationship is shown in the passage?

scientist to scientist
scientist to invention
invention to invention
invention to discovery