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

Based on the given words, here are the three categories I would classify them into:

1. **External Objects**: Sun, Earth, Moon
   - These are objects that can be seen and are external to the individual, such as celestial bodies and the planet we live on.

2. **Natural Phenomena**: Sun, Earth, Moon
   - These are natural phenomena that occur without human intervention, such as solar radiation, Earth's rotation, and the phases of the Moon.

3. **Concepts**: Sun, Earth, Moon
   - These are concepts that represent abstract ideas, such as the Sun as a source of energy and the Moon as a natural satellite.

Let me know if you need any further assistance.