What are comets?

Explanation

### Step-by-Step Text Solution:

**Step 1: Definition of Comets**
Comets are celestial objects that travel through space. They are often described as "dirty snowballs" because they are made up of a mixture of ice, dust, and rocky materials.

**Step 2: Composition of Comets**
Comets primarily consist of three main components:
- **Ice**: This can include water ice, carbon dioxide, ammonia, and other frozen gases.
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