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Polar talcs include a 9100 Series of three white grades with median particle sizes of 1.9 to 10 microns and dry brightnesses of 93-96.
They also indicate that galaxies are astoundingly diverse in their surface brightnesses. While observatories in Chile are blessed with some of the darkest skies in the world, from their grounds you can barely see these Milky Way companions against the sky's natural night brightness (see the box on the facing page).
But comparing the varying brightnesses recorded at adjacent pixels on the same CCD image yielded a more accurate average value, Tonry says.

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