Here's why:

* Composition: Jupiter's atmosphere is primarily composed of hydrogen and helium, but it also contains significant amounts of ammonia, methane, and water.

* Cloud Layers: Jupiter has multiple layers of clouds, and the uppermost layer is made of ammonia crystals, which are white.

* Appearance: This is why Jupiter appears as a pale, yellowish-brown color with distinct white bands across its surface.

While other planets like Saturn also have ammonia in their atmospheres, Jupiter's clouds are more prominent due to its larger size and distinct cloud layers.