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- Fri Mar 13, 2015 4:32 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Galaxy and Cluster Create Four of... (2015 Mar 09)
- Replies: 54
- Views: 63688
Re: APOD: Galaxy and Cluster Create Four of... (2015 Mar 09)
Why do four images appear? Why not two, or six, or etc.? Why doesn't the lens produce a ring?