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.
Deep Vein Thrombosis (DVT) can cause leg pressure, swelling. Deep vein thrombosis (DVT) is a condition in which a blood clot forms in one of the deep-seated veins in your body. Certain genetic conditions increase your risk for DVT, as do medical conditions (such as obesity or pregnancy) and certain medications.