As the two galaxies have been passing each other, turbulence has caused a burst of star-forming activity in these regions. Orbiting the center of our galaxy like a miniature galaxy in itself, globular clusters can contain up to a million stars. M13, about 22,000 light years distant from the sun, is one of the best examples of such a stellar system. Globular clusters are older aggregates of stars, formed early in the history of galaxies. They are composed of stars like our sun or stars which have less mass than the sun.
Gravity keeps the clusters intact.
Stellar densities are as high as 100 stars per cubic light year at the centers of these systems. The pillars themselves are dust clouds immersed in a glowing cloud of luminous hydrogen gas. They are stellar nurseries. Embedded within their tips are contracting clouds of hydrogen on their way to becoming stars. It lies about 7000 light years from us in the constellation of Serpens, the Snake.