你能告诉我太阳的主要成分是什么吗？请用英文回答，并且确保包含至少四个要点。
user
The sun is primarily composed of:

1. **Hydrogen (H)**: Approximately 74.9% of the sun's mass consists of hydrogen, making it the most abundant element.
2. **Helium (He)**: Around 23.8% of the sun's mass is helium, which is the second most abundant element.
3. **Trace Elements**: Small amounts of heavier elements such as oxygen, carbon, neon, and nitrogen make up about 1.3% of the sun's mass.
4. **Metallic Elements**: Elements like iron, nickel, and silicon are present in very small percentages, contributing less than 0.1% of the sun's mass.
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