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Ruben Barbosa

RRBBarbosa

About

• Has been an amateur astronomer since 2000 and likes to spread astronomy.

• The areas of Astronomy with the greatest interest are Exoplanetology, Radio Astronomy and Astrophotography.

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3. Star Clusters & Comets A collection by Ruben Barbosa

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

* They are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers.
* Are found in the halo of a galaxy and contain considerably more stars and are much older than the less dense open clusters, which are found in the disk of a galaxy.
* Are fairly common; there are more than 150 currently known globular clusters in the Milky Way.
* Orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more.
* Typical results for globular clusters are that they may be as old as 12.7 billion years.

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