Jupiter is a gas giant, meaning it doesn't have a solid surface like Earth. Instead, it's primarily composed of hydrogen (H) and helium (He), just like the Sun.

Here's a breakdown of Jupiter's composition:

* Hydrogen (H): About 89.8% by mass

* Helium (He): About 10% by mass

* Trace elements: These include methane (CH4), ammonia (NH3), water (H2O), and traces of other elements like phosphorus, sulfur, and carbon.

While hydrogen and helium are the dominant elements, the trace elements play a significant role in Jupiter's appearance and atmospheric phenomena. For example, the bands and colors we see in Jupiter's atmosphere are due to the presence of these trace elements.