Hi Alex,
Quote:
Originally Posted by AlexN
Thanks Les, Would you mind filling me in on what I've missed out on in my list? I would be very interested to know...
Would one be a dense star cloud?
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Nnnnooo, not a star cloud.
You missed Cr 240, Hogg 10, Tr 18 and Hogg 12 -- all O.Cs.
But the biggie is at the centre of RCW57 -- NGC 3603. Possibly the most massive and populous O.C in the Milky Way and 20,000 ly away. Westerlund 1 and "The Arches" cluster also vie for that title and a couple of others. NGC 3603 is the probable favourite.
http://hubblesite.org/newscenter/arc...a/format/zoom/
Overview:
http://en.wikipedia.org/wiki/NGC_3603
An intensely interesting cluster containing the star Sher 25 -- a star that will go supernova very, very soon (in astronomical time-scales). Could well be the next Milky Way supernova.
Best,
Les D