Although called Half Dome, a more correct name would be something like "80% Dome". As it turns out, from most views - like this one from the Panorama Trail - Half Dome is actually Whole Dome. Clouds Rest is in the background, while Mount Broderick is to the center-right, and Grizzly Peak is in the foreground (straight below Half Dome).
Page Scores range from 0% to 100%. The higher the score, the higher the perceived quality of the image. Score is not a simple average of votes, but takes into account the number of votes and the power of the voters.
For every object, a hit is registered each time the object's main page is viewed. A user's hits are the sum of all the hits on the objects he or she owns.