Globular clusters are groups of several hundred thousand very old stars which are located outside the plane of our galaxy in the so-called “galactic halo“. These stars are about as old as our galaxy. Because they are some ten thousand light-years away from the Sun, they appear in binoculars only as small speckles of light. Most of the over 100 known globular clusters need at least medium-sized telescopes at higher magnifications to resolve them into individual stars. The concentration of the globular clusters varies – some are compact, small balls of stars while others are very loosely concentrated globular clusters which are more reminiscent of densely packed open clusters.