We worked with eight telescopes around the world. It’s a system in which each telescope looks at the same target, the galaxy M87, at the same time. When the radiowave comes in, the antenna converts it into an electric signal. Then you take the signals from each antenna into one central computer, and use certain mathematical theorems to convert the data into image. To put it simply, we had a network of antennas, and each antenna worked like a pixel for a camera. Of course the problem is that eight pixels are not very much. So one thing you do is you wait a few hours because the earth is rotating, which means that the image is also rotating. Then you can cover more pixels.