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.
Leg pain can come from a variety of causes. Your health care professional has specific ways to discover if the cause is P.A.D. Other non-P.A.D. common causes of leg pain may include: Deep vein thrombosis (DVT), which occurs when a blood clot (thrombus) forms in the larger veins of the area. This clot can interfere with blood flow, and it may break off and travel through the bloodstream (embolize).