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This picture was created from images forming part of the Digitized Sky Survey 2 (DSS2). It shows the rich region of sky around the young open star cluster NGC 2547 in the southern constellation of Vela (The Sail). The Universe is an old neighbourhood - roughly 13.8 billion years old. Our galaxy, the Milky Way, is also ancient - some of its stars are more than 13 billion years old. Nevertheless, there is still a lot of action: new objects form and others are destroyed. In this image, you can see some of the newcomers, the young stars forming the cluster NGC 2547. But, how young are these cosmic youngsters really? Although their exact ages remain uncertain, astronomers estimate that NGC 2547's stars range from 20 to 35 million years old. That doesn't sound all that young, after all. However, our Sun is 4600 million years old and has not yet reached middle age. That means that if you imagine that the Sun as a 40 year-old person, the bright stars in the picture are three-month-old babies. Most stars do not form in isolation, but in rich clusters with sizes ranging from several tens to several thousands of stars. While NGC 2547 contains many hot stars that glow bright blue, a telltale sign of their youth, you can also find one or two yellow or red stars which have already evolved to become red giants. Open star clusters like this usually only have comparatively short lives, of the order of several hundred million years, before they disintegrate as their component stars drift apart. Clusters are key objects for astronomers studying how stars evolve through their lives. The members of a cluster were all born from the same material at about the same time, making it easier to determine the effects of other stellar properties.
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Image Credit: ESO/Digitized Sky Survey 2
Acknowledgement: Davide De Martin