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.
Other non-P.A.D. common causes of leg pain may include: A muscle cramp (also called a charley horse), frequently caused by the following: Dehydration or low amounts of potassium, sodium, calcium, or magnesium in the blood. Medications, such as diuretics, which can cause you to lose too much fluid or minerals.