From DeepSkyVideos.

Dr Meghan Gray discusses M52 (NGC 7654) and its huge array of variable stars.
More links and info in full description ↓↓↓

Dr Gray is an astronomer at the University of Nottingham: https://twitter.com/emeegray

Messier Object Playlist: http://bit.ly/MessierObjects

The main paper discussed: https://iopscience.iop.org/article/10.1088/2041-8205/746/1/L7

Harvard University Archives: https://library.harvard.edu/libraries/harvard-university-archives

The Genesis Rock: https://youtu.be/yvhLBzsDwSQ

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Series by Brady Haran
This episode filmed and edited by James Hennessy