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Our Daily Challenge - Straight and Narrow

Plasma capillary

 

Hydrogen's single electron can exist at six possible energy quanta. When one falls from the 3rd to the 2nd principal quantum number, a stunning 656nm red is created.

 

Pentax SMC 50mm f/1.2, taken at f/4

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Uploaded on February 27, 2022
Taken on February 25, 2022