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- Mon Apr 12, 2010 9:39 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: IC 418: The Spirograph Nebula (2010 Apr 11)
- Replies: 7
- Views: 1814
Re: APOD: IC 418: The Spirograph Nebula (2010 Apr 11)
The expanding gas shell might have been "spirographed" by an orbiting sister star or planet when the expanding gas cloud diameter was small and as the shock front passed through the orbit of this sister star or planet. Then, the impressed structure might persist in the gas envelope as it e...