A ring between two diamonds

The “ring” in this case is the planetary nebula called the “Ring nebula” (Messier 57) in the constellation Lyra, and the diamonds are the two bright stars either side of the ring namely Beta and Gamma Lyrae.  Alpha Lyrae is of course the brilliant blue-white star Vega, one of the “summer triangle” of stars comprising Vega, Deneb and Altair.

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