NASA’s October 26 Astronomy Picture of the Day presents a deep, assigned-color view of M42, a nearby star-forming region about 1,500 light-years away.
2026 October 26 – M42: The Great Nebula In Orion
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Your Book Review: The Ghost In My Brain
An anonymous ACX contest review discusses Clark Elliott’s concussion memoir, its account of lasting impairment and its claims about treatment.
APOD: 2026 October 25 – Dark Matter In A Simulated Universe
NASA’s Oct. 25 Astronomy Picture of the Day features a simulation of dark matter filaments and sparse clumps of ordinary matter.
San Francisco Meetup This Saturday
Astral Codex Ten’s San Francisco meetup is scheduled for Saturday, Oct. 24, at Mox, with an RSVP requested for the venue door code.
APOD: 2026 October 23 – Andromeda In Southern Spring
NASA’s October 23 Astronomy Picture of the Day shows the Andromeda Galaxy above the hills near Mullion, Australia, during southern spring.
NASA Invites Media To 2026 Von Braun Space Exploration Symposium
NASA’s Oct. 26-28 symposium in Huntsville will cover Artemis missions, lunar infrastructure, propulsion and the space workforce.
Scroll-linked torpor: A Look Inside “Hibernaculum — Where Winter Sleeps” (FABLE/175)
“Hibernaculum — Where Winter Sleeps” — see it live. What if a…
Sixteen Years After Deepwater Horizon, Deep Sea Life Shows Few Signs Of Recovery
A Gulf of Mexico study found steep declines in deep-sea animals after Deepwater Horizon and little evidence populations have recovered.
Open Thread 456
Astral Codex Ten’s weekly Open Thread 456 shares meetup updates, an AI safety grantmaking survey and new AI prediction-market details.
Your Book Review: Storm Of Steel
An anonymous finalist in Astral Codex Ten’s 2026 book review contest argues that Ernst Jünger’s firsthand World War I account deserves wider attention.
