Pictures of the Hercules Globular Cluster
M13, the Hercules Globular Cluster, is perhaps the most famous of all globulars.
Globular clusters are thought to be among the oldest objects in the Universe, and perhaps the most famous of all is M13, known as the Hercules Globular Cluster or the Great Globular Cluster in Hercules.
These spherical collections of gravitationally-bound stars are thought to have formed during the early Universe, making them fascinating objects for astronomers and cosmologists to study.
Globular clusters contain hundreds of thousands of stars, and make for wonderful objects to observe through a telescope or to photograph.
The Hercules Globular Cluster contains over 100,000 stars and is one of the brightest star clusters that can be seen in the northern hemisphere sky.
It is about 25,000 lightyears from Earth and was discovered by Edmond Halley in 1714.
The stars at the core of M13 are so densely packed together that the region is about 100 times more dense than the region around our Sun.
See if you can spot it yourself. It can be seen in the Hercules constellation through a pair of good binoculars under dark skies during springtime.
For more information on observing it and other fine globulars, read our guide to globular clusters.