by MarkBour » Thu Apr 12, 2018 3:28 pm
neufer wrote: ↑Thu Apr 12, 2018 1:06 pm
- An average distance of 1 light year sounds about right
...although their night skies are probably no darker than our own during a full moon.
I assume you meant "no brighter than ..."
Wow! That's surprising to me.
Thanks for posting the fine image of M22, neufer. In that image, I think I am now understanding that most of the dots one sees (the many smaller ones) are actually not part of the cluster, but are part of our galaxy's central bulge which is behind M22. The first couple of times I saw this view (I only see this on the computer, never through a scope), I was not aware of that, so I thought the cluster had many more stars in it than it actually does?
Well, but then Wikipedia has this:
https://en.wikipedia.org/wiki/Messier_22
It was one of the first globular clusters to be carefully studied first by Harlow Shapley in 1930. He discovered roughly 70,000 stars and found it had a dense core
And the caption says about 100,000 stars. So, I'm not very good at estimating on that scale, but it seems like every dot in the image you posted might barely make it to 70,000.
I'm somewhat confused, for sure.
[quote=neufer post_id=281465 time=1523538404 user_id=124483]
[list]An average distance of 1 light year sounds about right
...although their night skies are probably no darker than our own during a full moon.[/list][/quote]
I assume you meant "no brighter than ..."
[quote]https://en.wikipedia.org/wiki/Messier_22<< ... estimates of a total 5 to 100 black holes within M22 ...>>[/quote]
Wow! That's surprising to me.
Thanks for posting the fine image of M22, neufer. In that image, I think I am now understanding that most of the dots one sees (the many smaller ones) are actually not part of the cluster, but are part of our galaxy's central bulge which is behind M22. The first couple of times I saw this view (I only see this on the computer, never through a scope), I was not aware of that, so I thought the cluster had many more stars in it than it actually does?
Well, but then Wikipedia has this: [url]https://en.wikipedia.org/wiki/Messier_22[/url]
[quote]It was one of the first globular clusters to be carefully studied first by Harlow Shapley in 1930. He discovered roughly 70,000 stars and found it had a dense core[/quote]
And the caption says about 100,000 stars. So, I'm not very good at estimating on that scale, but it seems like every dot in the image you posted might barely make it to 70,000.
I'm somewhat confused, for sure.