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.
What Causes Leg Cramps? Leg cramps at night are called recumbency cramps, and are caused by spasmlike muscle contractions. You might also experience leg cramps after exercising if you are dehydrated. In both cases leg cramps can be caused by electrolyte or mineral imbalance in the body. If your leg cramps are brought on by exercise, you may be dehydrated.