What is the fuzzy cloud of material around a comet called?

Explanation

**Step-by-Step Solution:**

1. **Understanding Comets**: Comets are celestial bodies made primarily of ice, dust, and rocky material. They originate from the outer regions of the solar system.

2. **Behavior Near the Sun**: When a comet approaches the Sun, the heat causes the ice within the comet to melt and vaporize. This process is known as sublimation.

3. **Formation of the Cloud**: As the ice melts, it releases gas and dust particles. These particles are expelled from the comet's nucleus, creating a surrounding cloud.

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