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 cardiovascular causes of leg swelling include thrombophlebitis, venous insufficiency and a large blood clot in the leg, often in the calf. This is called a deep vein thrombosis. Other serious causes of leg swelling include kidney disease, preeclampsia and liver disease, such as cirrhosis of the liver. Orthopedic conditions that can cause leg swelling include dislocations, bone fractures, a cast that is too tight, contusion, ankle sprain, and ligament injuries and tendon injuries.