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Astronomy and Cosmology
Astronomy and Astrophysics
How far away are stars in a typical star cluster from each other?
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[QUOTE="snorkack, post: 6837052, member: 436348"] Nope. The main sequence turnoff in Milky Way globular clusters is around 1 solar mass. But my problem is with the phrase "typical star cluster". Look at the nearest. Big Dipper. Nicely around 20 degrees across, good to grasp by eye. (25 degrees counting Alkaid, but it actually is a background star). Contains a rough quadrangle, longest side 10,3 degrees (again counting a background star Dubhe). [URL]https://owlcation.com/stem/Angular-distances[/URL] Brightest stars at about +1,8 easy night sky objects. And now look at another cluster. Orion Trapezium. [URL]https://skyandtelescope.org/observing/star-trapping-in-orions-trapezium/[/URL] Also contains a rough quadrangle. Except... the long side is 14,9´´. If you want to see it in a comparable scale with Big Dipper, you will need 2500x magnification. And remember proper light gathering area, too. You would need maybe 18 m aperture. In such a 2500x18000 telescope, the objects are brightened by 17 magnitudes... which means that θ[SUP]1[/SUP] Ori C, magnitude +5,1 in sky, will be -11,9 in your telescope. Or for an observer living about 0,6 ly from Trapezium. Almost as bright as full Moon. It is almost 14 magnitudes brighter than the brightest star in Big Dipper. Two very different clusters. Which of them are you calling "typical"? [/QUOTE]
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How far away are stars in a typical star cluster from each other?
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