Mars has a very thin atmosphere which is mostly carbon dioxide. Jupiter is the largest planet in the Solar system. It would take about 12 Earths side by side to go from one edge to the other. It has 28 known satellites. The picture of Jupiter shows its different colored cloud belts and its red spot, a cyclone-like area.
Complex molecules are probably responsible for the different cloud colors.
Jupiter doesn't have a surface that an astronaut could land on. Saturn has bright spectacular rings made primarily of water ice and rocky material. It is also a gas planet with no accessible surface. Amazing as it seems, it is less dense than ice and would float in a tub of water. It has eighteen named satellites, more than any other planet.