Astrum Extra
Hosted by Astrum Extra
A solo-narrated documentary series explaining complex topics in cosmology, astrophysics, and space exploration history with high-quality animations.
This is a solo-narrated educational channel that repackages and expands on content from the primary "Astrum" channel. It uses a documentary style with extensive animations and clear narration to explain complex topics in astronomy, from the mysteries of dark matter to the engineering challenges of the Apollo missions.
“Its primary distinction is its format; it curates and compiles videos from its more popular sibling channel, "Astrum," into long-form thematic episodes for uninterrupted, deep-dive viewing.”
Who hosts this show
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.
Credentials & credits
- Creator of the Astrum YouTube channels
- Director, MCCOLGAN ASTRUM SPACE LIMITED
- YouTuber and filmmaker with over a decade of experience
Other ventures
- Astrum (main YouTube channel)
- Astrum Space (podcast)
- Astrum Earth (YouTube channel)
- Astrum Newsletter
- Astrum Merch & Displate Posters
What kind of podcast
- Country
- United Kingdom
- Region
- uk
When new episodes drop
- 01The Universe’s Structure Doesn’t Make SenseJun 21, 2026 · 1h 05m
- 02The Craziest Orbits in the UniverseJun 14, 2026 · 49 min
- 03These Stars Don't Follow the RulesJun 7, 2026 · 1h 04m
- 04The Truth About the First Moon LandingMay 28, 2026 · 36 min
- 05What Apollo 11 Really Found on the MoonMay 28, 2026 · 31 min
- 06Weird Things Happen When You Spin This FastMay 20, 2026 · 1h 30m
- 07JWST’s Recent Images Are Even More BreathtakingMay 17, 2026 · 55 min
- 08Paradoxes That Push the Limits of RealityMay 7, 2026 · 57 min
Notable episodes
- 01The Truth About the First Moon Landing
Details the numerous, lesser-known scientific and engineering challenges, near-failures, and ingenious solutions that made the Apollo 11 moon landing possible.
- 02These Stars Don't Follow the Rules
Explores the scientific paradox of Polaris, the North Star, and how its unusual behavior challenges current models of stellar evolution and cosmic measurement.
- 03The Universe’s Structure Doesn’t Make Sense
A comprehensive dive into the cosmic web, the mystery of the universe's 'missing' matter, and the ongoing scientific crisis known as the 'Hubble tension'.
What you'll be asked on this show
This is a solo-narrated documentary-style show and does not feature guest interviews. The host poses rhetorical questions to frame topics for the audience, but it is not an interview-based format.
This is a solo-narrated, non-interview show. Host Alex McColgan presents well-researched scripts in a calm, documentary-style narration. The content is heavily supported by high-quality animations, diagrams, and archival footage to illustrate complex scientific and historical concepts.
Signature segments
- · Host Introduction: "I'm Alex McColgan, and you're watching Astrum."
- · Long-form compilation format
- · Patreon supporter thank-you roll
- · Use of extensive animations and diagrams
- · Rhetorical questions to frame topics
Topics covered repeatedly
Where to find this show
Audience & reach
Subscriber and view counts are pulled live from YouTube and re-verified on a 30-day cycle. Listener estimates for the RSS feed aren't published here unless they're host-verified.
Pitch Astrum Extra
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People also ask
- What is the host's real name?
- The creator and host is Alex McColgan.
- What is the difference between Astrum and Astrum Extra?
- Astrum is the main channel for new, individual documentary videos. Astrum Extra is a secondary channel that features long-form compilations of videos from the main channel, as well as other content that doesn't fit the main channel's format.
- Is this an interview show?
- No, it is a solo-narrated documentary-style show. It does not feature guest interviews.
- Where is the host from?
- Alex McColgan is from the UK, with public records indicating residence in Wales.
- Is the podcast still running?
- Yes, the YouTube channel is active, publishing videos on a weekly basis as of mid-2026.
Built from the show's public RSS feed, YouTube, the host's own websites, and the cited sources below. Computed and AI-extracted fields are labelled. Facts only — no private info, no fabrication, no transcripts republished.
Sources & how this page was built
This page is AI-assisted, grounded in the public sources cited below, and host-verifiable. We publish facts only; we do not republish transcripts. If anything here is wrong, the host can claim and correct the page above.Model: gemini-2.5-pro · high confidence
- [01]Astrum Extra - YouTubeyoutube.com
- [02]Astrum (Main Channel) - YouTubeyoutube.com
- [03]MCCOLGAN ASTRUM SPACE LIMITED - GOV.UKfind-and-update.company-information.service.gov.uk
- [04]Why This Space Creator Pivoted to Memberships - The Publish Pressthepublishpress.com
- [05]Astrum Space - Apple Podcastspodcasts.apple.com
- [06]Alex McColgan Work Blogalexmccolgan.blogspot.com
- [07]Sleep Space From Astrum | Alex Mccolganallyoucanbooks.com
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