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Far be it from me to argue with UT, but since hair splitting is as hobby of mine...
The diffuse glow is billions of individual stars. The globular clusters are those glowing blobs you see surrounding M-104, which are made up of, as luck would have it, many thousands of individual stars.
We have a number of globular clusters in our own night sky which are quite impressive to view in a telescope. My personal favorite is M-13 located in the constellation Hercules. Awesome sight in a 10" scope with a nice eyepiece. You can practically fall into it...
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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