NGC 3603 Interesting cluster

Link
http://esciencenews.com/articles/2010/06/02/hubble.catches.stars.move

Credit: NASA, ESA and Wolfgang Brandner (MPIA), Boyke Rochau (MPIA) and Andrea Stolte (University of Cologne)"The cluster, formally known as the NGC 3603 Young Cluster, is about 20 000 light-years from the Sun which makes these measurements extraordinarily difficult."
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This is 17 light-years across. This picture cast severe doubts on Newtonian mechanics and Kepler orbits. I need to think more about that distance and number of stars in the cluster.
http://webcache.googleusercontent.com/search?q=cache:http://hubblesite.org/newscenter/archive/releases/2007/34/fastfacts/
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Another great paper on NGC 3603
Galactic Starburst NGC 3603 from XRay to Radio

A. F. J. Moffat ,¹ M. F. Corcoran ,^2,3 I. R. Stevens ,⁴ G. Skalkowski ,¹ S. V. Marchenko ,^1,5 A. Mücke ,^1,6 A. Ptak ,⁷B. S. Koribalski ,⁸ L. Brenneman ,³ R. Mushotzky ,³ J. M. Pittard ,⁹ A. M. T. Pollock ,¹⁰ and W. Brandner ¹¹

The Astrophysical Journal, 573:191-198, 2002 July 1
© 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.

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This picture was taken on 

2007 October 5 

http://apod.nasa.gov/apod/ap071005.html

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There is a Zoomable picture from ESO at 

http://www.eso.org/public/images/eso1005a/

Credit ESO