📚 GCSE Physics: Cosmology Key Points | GCSE 物理：宇宙学考点精讲
Cosmology is the study of the Universe as a whole, including its origin, evolution, and eventual fate. In GCSE Physics, you are expected to understand the Solar System, the life cycle of stars, redshift, the expanding Universe, and the evidence for the Big Bang theory.
宇宙学是研究整个宇宙的起源、演化和最终命运的学科。在 GCSE 物理中，你需要理解太阳系、恒星的生命周期、红移、膨胀的宇宙以及大爆炸理论的证据。
1. Structure of the Solar System | 太阳系的结构
Our Solar System consists of the Sun, eight planets, dwarf planets, moons, asteroids, and comets. The Sun is a main-sequence star, producing energy by nuclear fusion of hydrogen into helium. The planets in order from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The inner four planets are rocky, while the outer four are gas giants (Jupiter and Saturn) and ice giants (Uranus and Neptune).
我们的太阳系由太阳、八大行星、矮行星、卫星、小行星和彗星组成。太阳是一颗主序星，通过氢聚变为氦的核聚变产生能量。离太阳由近及远的行星依次是：水星、金星、地球、火星、木星、土星、天王星和海王星。内四颗行星是岩石行星，外四颗是气态巨行星（木星和土星）及冰巨星（天王星和海王星）。
| Order | Planet | 中文 | Type |
|---|---|---|---|
| 1 | Mercury | 水星 | Rocky |
| 2 | Venus | 金星 | Rocky |
| 3 | Earth | 地球 | Rocky |
| 4 | Mars | 火星 | Rocky |
| 5 | Jupiter | 木星 | Gas Giant |
| 6 | Saturn | 土星 | Gas Giant |
| 7 | Uranus | 天王星 | Ice Giant |
| 8 | Neptune | 海王星 | Ice Giant |
2. Planetary Orbits and
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