M11 is estimated as having almost 3,000 stars with at least 500 at 14 magnitude. It contains many yellow and red giants thought to be 500 million years old.

Due to gravitational disruption, the M12 cluster continuously loses stars when it passes through the Galaxy´s central plane. The lost stars move into orbits similar to that of the cluster and populate the halo of the Milky Way.

The Hercules Globular Cluster is thought to be between 15 and 25 billion years old. In 1974 it was selected as one of the first targets for radio messages addressed to possible extra-terrestrial intelligence.

It good conditions, and with no Moon interfering, M13 is visible to the naked eye.

Because of its considerable distance and the resulting faintness of its stars, M14 is not as easily resolvable as the nearer globular clusters. In smaller telescopes, it appears more like an elliptical galaxy at first glance, becoming faint towards the outer edges, with an almost round central hazy disk. Some graininess can be noticed in 4-inch telescopes under good conditions, whilst an 8-inch may show a trace of resolution. Larger telescopes can resolve the outer areas.

M15 is probably the densest globular cluster in the Milky Way and, under very good conditions, is on the limit of visibility for the naked eye. Binoculars reveal a round nebulous object, whilst a 4-inch telescope shows a round mottled nebula with the very brightest stars visible. In larger telescopes more stars become visible although the compact core remains unresolved. Streams of stars seem to radiate out in all directions, less concentrated toward the West.