What is the name of this phenomenon?
Iridescence is the phenomenon of certain surfaces that appear to gradually change colour as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, butterfly wings and sea shells, as well as certain minerals. It is often created by structural coloration (microstructures that interfere with light).
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the United States
the United Kingdom
What, excluding water vapour, do night shining clouds consist?
rocket engines' exhaust gases
all of above