"Venus has about 90 times more air than Earth. It isn't mainly oxygen and nitrogen as here — it's carbon dioxide. But carbon dioxide doesn't absorb visible light either. What would the sky look like from the surface of Venus if Venus had no clouds? With so much atmosphere in the way, not only are violet and blue waves scattered, but all other colours as well — green, yellow, orange, red. The air is so thick, though, that hardly any blue light makes it to the ground; it’s scattered back to space by successive bounces higher up. Thus the light that does reach the ground should be strongly reddened — like an Earth sunset all over the sky. Further sulfur in the high clouds will strain the sky yellow. Pictures taken by the Soviet Venera landers confirm that the skies of Venus are a kind of yellow-orange."