In recent years, NASA instruments have painted a new picture of these strange objects that are, to many, the most fascinating objects in space. What happens at the edge of a ... We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby. read more
Considering the above mentioned points, yes there are pictures which are showing the presence the blackholes. Each galaxy is having a massive black hole in it's center. Those center galactic blackholes are billions of times massive than sun. The center galactic massive blackhole of Milky-way is Sagitarius A*. Take our solar system for example. read more
Many black holes have objects around them, and by looking at the behavior of the objects you can detect the presence of a black hole. You then use measurements of the movement of objects around a suspected black hole to calculate the black hole's mass. read more
Scientists are also able to detect the presence of a black hole by the amount of radiation being emitted from an area. The extremely hot x-rays we’ve detected are thought to come from the incredibly fast-moving disk of particles surrounding the hole. read more