Alexander James McColgan

Also known as Astrum Extra

Astrum Extra is the secondary YouTube channel for the Astrum brand, created and hosted by Alex McColgan. It features long-form compilations and exclusive content that expands on the main channel's educational deep dives into space and astronomy. McColgan started the primary Astrum channel in 2013 to make space science more accessible through video essays. The Extra channel serves as a library for extended viewing and for content that may not fit the main channel's format.

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