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.
It happens to almost all of us on long trips: swollen legs and ankles. According to the Mayo Clinic, slight swelling is harmless, caused by temporary poor circulation from sitting still for extended periods of time during a long flight, car or bus ride, or a train trip. Occasionally, swelling can cause deep vein thrombosis (DVT), in which a blood clot forms in a lower leg vein. However, unless you are at risk for DVT -- are older, overweight, have a history of blood clots or have recently undergone surgery -- leg swelling is a temporary, uncomfortable and easily preventable condition.