Space.com September 17, 2026 • 20:27

On this day in space! Sept. 17, 1789: Astronomer William Herschel discovers Saturn's 'Death Star' moon Mimas - Space

By Tariq Malik

On this day in space! Sept. 17, 1789: Astronomer William Herschel discovers Saturn's 'Death Star' moon Mimas - Space

While Mimas was discovered today in 1789, it wasn't until 1980 that we learned of its Death Star shape.

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