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Astronomy Picture of the Day - Curious Cometary Knots in the Helix Nebula

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August 5, 2026 • 74 views
Original source: Freerepublic.com

Explanation: What causes unusual knots of gas and dust in planetary nebulas? Seen also in the Ring Nebula, the Dumbbell Nebula and NGC 2392, the knots' existence was not initially predicted, and their origins are still not well understood. Pictured here is a …

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