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The bright head of the comet is known as...

The bright head of the comet is known as

A

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B

Nucleus

C

Coma

D

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**Step-by-Step Solution:** 1. **Understanding Comets**: Comets are celestial bodies composed of ice, dust, and rocky material. They originate from the outer parts of the solar system. 2. **Approach to the Sun**: When a comet approaches the Sun, the heat causes the ice within the comet to sublimate. Sublimation is the process where a solid turns directly into gas without becoming liquid. 3. **Formation of the Coma**: As the ice sublimates, it releases gas and dust particles. This creates a glowing envelope around the comet's nucleus, which is referred to as the "coma." 4. **Identifying the Bright Head**: The coma is the bright, cloud-like structure that surrounds the nucleus of the comet. This is what we see as the bright head of the comet when it is observed from Earth. 5. **Conclusion**: Therefore, the bright head of a comet is known as the "coma." **Final Answer**: The bright head of the comet is known as the coma. ---
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