Astronomy & Astrophysics 101: Globular Cluster

[ad_1] This cluster of stars is known as Messier 15, and is located some 35 000 light-years away in the constellation of Pegasus (The Winged Horse). It is one of the oldest globular clusters known, with an age of around 12 billion years. Credit: NASA, ESA Globular clusters are stable, tightly bound clusters of tens […]

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