Recently, astronomers from the University of Texas Austin successfully measured the known heaviest black hole in space. At the centre of the galaxy M87, there exists a massive black hole measured at 6.6 billion solar masses. Scientists used a large-diameter telescope combined with a smaller one to collected data from thousands of dim stars and formed images that clearly depicts the influence the black hole exerts on its surrounding region. For now, there is still no direct evidence of the existence of black hole (no one has actually seen one). But scientists believe that soon, the event horizon of black hole will be detected in the future.