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BookmarkStar clusters are groups of stars which are gravitationally bound.
Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars, while open clusters generally contain less than a few hundred members, and are often very young..
For more information about the topic Star cluster, read the full article at Wikipedia.org, or see the following related articles:
Supergiant — Supergiants are the most massive stars. Supergiants can have masses from 10 to 70 solar masses and brightness from 30,000 up to hundreds of thousands ... > read more
Blue supergiant star — Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 - ... > read more
Open cluster — An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally ... > read more
Galaxy formation and evolution — The formation of galaxies is still one of the most active research areas in astrophysics; and, to some extent, this is also true for galaxy ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Star cluster at Wikipedia.org. See the Wikipedia copyright page for more details.
