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COSMIC FAIRY LIGHTS
Photograph by ESA/NASA
[Cosmic Fairy Lights] This shimmering jumble is Messier 5– a globular cluster consisting of hundreds of countless stars bound together by their collective gravity. However Messier 5 is no typical globular cluster. At 13 billion years old it dates back to near the beginning of the Universe, which is some 13.8 billion years of age. It is likewise one of the most significant clusters known, and at only 24,500 light-years away, it is not surprising that that Messier 5 is a popular website for astronomers to train their telescopes on.
Messier 5 likewise provides a puzzle. Stars in globular clusters grow old and wise together. So Messier 5 should, by now, include old, low-mass red giants and other old stars. However it is really brimming with young blue stars referred to as blue laggers. These stars spring to life when stars collide, or rip product from one another. [source]
Source: http://twistedsifter.com/2014/05/messier-5-globular-cluster/
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