Globular cluster M15 in Pegase - Globular cluster M15 in Pegasus - View of the...

Globular cluster M15 in Pegase - Globular cluster M15 in Pegasus - View of the globular cluster M15 by the Hubble space telescope. Located about 35,000 light years away from Earth in the constellation Pegase, M15 is one of 150 known globular clusters forming a vast halo around our galaxy. The bluish object in the middle left of the image is a planetary nebula: Kuestner 648 (Pease 1). Planetary nebulae are gas shells ejected by a star at the end of life, after its phase of red giante; they are very rarely observed in globular clusters or their presence is not yet well understood. The globular cluster Messier 15 is shown in this color image obtained with the NASA Hubble Space Telescope. Lying some 35,000 light - years from Earth in the direction of the constellation Pegasus, M15 is one of almost 150 known globular clusters that form a vast halo surrounding our Milky Way galaxy. The bluish object to the middle left of the image is a gas cloud surrounding a dying star, a planetary nebula known as Kuestner 648 (or Pease 1), its existence among a globular cluster is not well understood