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APOD: 2026 August 4 – Curious Cometary Knots in the Helix Nebula

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August 5, 2026 • 51 views
Original source: NASA

APOD: 2026 August 4 – Curious Cometary Knots in the Helix Nebula 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 thei…

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