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.
This can mean long hours on your feet and hours of pain. Other causes of leg and feet pain can include: 1  Swelling leading to excess weight gain from water retention. 2  Not enough rest. 3  Sciatic nerve pain. 4  Poor circulation (regular exercise can be somewhat helpful in alleviating this problem).