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Originally Posted by Takeda Shingen
'Spacing' is bad terminology on my part, but I was trying to draw an analogy to recording. Essentially, the more pixels you have, the less 'area' each has to cover, and the greater the clarity and color vibrance you will have. You end up with a larger image, or an image that will retain fidelity when enlarged.
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There really is space between the pixels, and it can have an effect, just like the regular grid locations of those pixels can cause aliasing effects that you will not get on film. Now, film doesn't have infinite resolution, it also has a certain grain size which can become quite noticeable on high ISO film. but those grains are randomly distributed, which avoids some of the typical digital effects. Also, on colour film, the colours overlap. In typical CCD's, they are side by side, reducing the area sensitive to each colour.
High megapixel values are good, yes, but for the same sensor size and technology level they lower the dynamic range. Depending on light conditions, you might want to just downsample the high resolution image afterwards to reduce noise.
Oh, and it certainly is possible to do black and white photography with digital cameras. In fact, some of the best performing CCD sensors are monochrome. However, this is for scientific equipment, and I do not know of affordable general use cameras with such sensors. There's stuff available for attaching to telescopes though, including some for the amateur market.