Why can't I see what is described when I hover my mouse cursor over the picture as instructed?
You need to enable Javascript for your browser and/or allow scripts to run for the Web page being viewed. This may be potentially unsafe to do on some (unethical) websites. Consult your Web browser's documentation for more information.

On the "Stellar Closeup" Sky Maps, what do the "distance view" colors mean?
Each color represents the spectral type of the stars shown.