When does a comet become visible to us ?

Explanation

To determine when a comet becomes visible to us, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Comets**:
- A comet is a celestial body made of ice, dust, and rocky material. It orbits the Sun and can be found in the outer regions of the solar system.

2. **Visibility Factors**:
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