This is a close-up of M13 (Hercules Globular Cluster). Globular clusters are collections of stars very tightly bound by gravity and contain some of the oldest stars in the galaxy. There are an estimated 150-160 such clusters in the Milky Way. Their origin and role in galactic evolution are still poorly understood.
Date: May, 2014
Location: Green Valley, Arizona
Telescope: Takahashi FSQ-106EDX
Camera: SBIG STT-8300M
Filters: Astrodon Gen 2
Mount: AstroPhysics 1200
Exposure: LRGB = 860:120:120:120 minutes, all unbinned