I've seen the same planet colored differently in different photos. Here are the true colors of major planets to the best of my knowledge (spacecraft photos appearing in the media often have false coloration): Mercury: grey; Mercury has practically no atmosphere, so we just see the rocky surface.
Sitting for hours can cause poor circulation which is a major cause of the heavy legs syndrome and if there no underlying medical condition and the feeling worsens when walking upstairs, then curiously enough, you might like to look at your diet for clues.
A lack of potassium or calcium can also be the underlying cause, as well as cold weather. Acute leg cramps frequently are confused with restless legs syndrome (RLS) which is a different and more serious, chronic condition characterized by discomfort and persistent throbbing and pulling sensations in the legs.