Image depicting the Morgan-Keenan-Kellman spectral classification of main-sequence stars (1943). Sizes taken from the table at the stellar classification article on the English Wikipedia.

Some notes:

1. These are main sequence stars only.
2. The "floor" is there so we can compare the amount and color of light coming from each star. The light intensity isn't proportional (that'd be rather intense), but is somewhat related to the actual ones.
3. Larger stars show more color since these output a lot more on the invisible spectrum. I tried to convey this by making them less white in the middle.
4. The star's smoothness and the floor reflection were aesthetic choices.

Rendered using POV-Ray.

Derivative works of this file:  Morgan-Keenan spectral classification zoom.png

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