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> Globular cluster M15 in Pegasus
Globular cluster M15 in Pegasus
author: Nasa/Hubble heritage team/Novapix
reference: a-agb70-78001
Image Size 300 DPI: 5 * 7 cm
The globular cluster Messier 15 is shown in this color image obtained with the NASA Hubble Space Telescope's Wide Field Planetary Camera 2. Lying some 40,000 light-years from Earth in the direction of the constellation Pegasus, M15 is one of nearly 150 known globular clusters that form a vast halo surrounding our Milky Way galaxy. The image, attempts to show the stars in M15 in their true colors. The brightest cluster stars are red giants, with an orange color due to surface temperatures lower than our Sun's. Most of the fainter stars are hotter, giving them a bluish-white color. The pinkish object to the upper left of the cluster's core is a gas cloud surrounding a dying star, a planetary nebula known as Kuestner 648, its existence among a globular cluster is not well understood.
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