How was the existence of gravitational waves first shown? (b) Which detectors exist around the world? Why did only LIGO detect GW150914? (c) Explain the components of the LIGO detectors. (d) Describe the different sources of noise. How was their impact reduced? (e) What indicates that the gravitational wave originated from the merger of a black hole? (f) Which are the methods used to search for gravitational wave signals in the detector data? (g) How were the source parameters (mass, distance, etc.) determined from the data

How was the existence of gravitational waves first shown? (b) Which detectors exist around the world? Why did only LIGO detect GW150914? (c) Explain the components of the LIGO detectors. (d) Describe the different sources of noise. How was their impact reduced? (e) What indicates that the gravitational wave originated from the merger of a black hole? (f) Which are the methods used to search for gravitational wave signals in the detector data? (g) How were the source parameters (mass, distance, etc.) determined from the data