Here's why:

* Jupiter's Atmosphere: Jupiter's atmosphere is primarily composed of hydrogen and helium, with trace amounts of methane, ammonia, and water.

* Ammonia Clouds: The white clouds we see on Jupiter are composed of ammonia crystals. These clouds form high in the atmosphere where temperatures are very cold.

* Other Colors: Jupiter's atmosphere also contains clouds of other colors, such as reddish-brown clouds (thought to be made of phosphine and sulfur compounds) and blue clouds (believed to be made of water ice).

Let me know if you have any other questions!