From DeepSkyVideos.

Professor Mike Merrifield discusses Caldwell 3 (aka NGC 4236) – leading to talk about the tip of the Red Giant Branch and so-called Helium Flashes. More links and info in full description ↓↓↓

Mike Merrifield is an emeritus professor from the University of Nottingham.

The M 81 group of galaxies: New distances, kinematics and structure – https://ui.adsabs.harvard.edu/abs/2002A%26A…383..125K/abstract

More Caldwell Catalogue videos: https://www.youtube.com/playlist?list=PLXJEVJey9Wz4RQK6uXH0O0t9504NnyzJL

Messier Objects playlist: http://bit.ly/MessierObjects

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Astronomy at The University of Nottingham: https://www.nottingham.ac.uk/astronomy/

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Video by Brady Haran