Correct Answer: C

Rationale: Mercury is the smallest planet in our solar system, with a diameter of about 4,880 kilometers. It is the closest planet to the Sun and completes an orbit in just 88 Earth days. Despite its proximity to the Sun, Mercury has extreme temperature fluctuations, ranging from -180°C at night to 430°C during the day. Its small size and lack of atmosphere prevent it from retaining heat. The planet’s heavily cratered surface resembles that of the Moon, indicating a long history of meteoroid impacts. Mercury’s study provides valuable insights into planetary formation and solar dynamics.

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