APOD: 2026 September 18 – Messier 33: The Triangulum Galaxy

GlobalScience2026-09-18

NASA's Astronomy Picture of the Day features an image of Messier 33, also known as the Triangulum Galaxy, accompanied by an explanation from a professional astronomer.

This is an AI-written summary of reporting by NASA, generated only from the source's own headline and abstract. Read the full story at NASA.

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