From DeepSkyVideos.
Dr Becky Smethurst discusses Messier 107 – also known as NGC 6171 – an Oosterhoff type I cluster. Extra M107 chat at: https://youtu.be/6TvR9gRJQTk
More links and info in full description ↓↓↓
Dr Becky’s website: https://rebeccasmethurst.co.uk/
Her own YouTube: https://www.youtube.com/drbecky
On the Two Oosterhoff Groups of Globular Clusters: https://ui.adsabs.harvard.edu/abs/1973ApJ…185..477V/abstract
Messier Objects playlist: http://bit.ly/MessierObjects
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Video by Brady Haran