The Earth revolves around the Sun in an elliptical orbit with a mean radius of $9.3 \times 10^{10} \ m$ in a period of $1$ year. Assuming that there are no outside influences,which of the following statements is true?
- AThe Earth's kinetic energy remains constant.
- BThe Earth's angular momentum remains constant.
- CThe Earth's potential energy remains constant.
- DAll of the above are correct.
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