The sequence of stellar spectral types is shown in the figure below.Explain why the hottest star (O5) has so little emission in the visible portion of the spectrum (450-700 nm), spectral types F-K show the most emission in the visible band, and still cooler stars (M type) once again show very little in the visible band. 
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Lemonade
A sweetened beverage made from lemon juice, water, and sugar, often served cold and considered refreshing, particularly in warm weather.
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A popular dish of Italian origin, consisting of a flatbread typically topped with tomato sauce, cheese, and various other ingredients, then baked.
Production Possibilities Frontier
A graphical depiction that shows the maximum quantity of one good that can be produced for every possible quantity of another good, given the available resources and technology.
Burrito
A type of Mexican street food consisting of a wheat flour tortilla wrapped or folded into a cylindrical shape to enclose fillings.
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