wonders-of-the-cosmos: Globular clusters: Messier 3, Messier 9 and Messier 15 A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their

wonders-of-the-cosmos: Globular clusters: Messier 3, Messier 9 and Messier 15 A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their

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