Category 1: Sun
Category 2: Earth
Category 3: Moon
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Classify the following words into three categories:

### Input:
Sun, Earth, Moon

### Response:
Category 1: Sun
Category 2: Earth
Category 3: Moon
assistant

The three categories for the given words are:

1. **Real-world objects**: Sun, Earth, Moon
2. **Natural phenomena**: Moon
3. **Variables or terms commonly used in mathematics or science**: Sun, Earth