What two types of waves are used to detect black holes

Black holes are detected as surrounding material (like gas) is funnelled by the force of gravity into a disk around the black hole. The gas molecules in the disk swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth.

Answer: X rays and gamma rays

Explanation: X rays emitted by the materials falling on the black holes and change the form because of very high temperature. These rays can be detected by using a specialized telescope.

Black holes also have very intensive effects on the neighbohoods around tehm by emitting very powerful gamma rays. These rays influence the nearby stars by devouring and spurring the growth of new stars.