Dr Becky Smethurst discusses Messier 107 also known as NGC 6171 an Oosterhoff type I cluster. Extra M107 chat at:    • M107  Dark Matter (extra footage)  ...  
More links and info in full description ↓↓↓

Dr Becky's website: https://rebeccasmethurst.co.uk/
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On the Two Oosterhoff Groups of Globular Clusters: https://ui.adsabs.harvard.edu/abs/197...

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Video by Brady Haran