Globular cluster in Pegasus is very far from Earth, specifically 33 600 light years and its diameter is approximately 175 light years. It contains more than 100 000 stars.

Most of the globular clusters are quite bright (M15 has magnitude 6.2), therefore there is no long exposure required. On the other hand longer exposures might overexpose the core, therefore I selected exposure time to 2 minutes.

M15_cluster_2015-11-10-30C-120s-26L16RGB-FL730