Considering the available options, the statement that is not a description of a comet is: "They are so close to the sun that they orbit every six months."
- This is because Comet is known to take many years before orbiting the sun.
- The shortest period is believed to be around 200 years before a comet could orbit the sun.
- While the longest period could take more than 200 years.
- However, comets are known to have small icy or snowball bodies.
- They also have different sizes and shapes.
- Also, when the sun heats a comet, it lights up and forms a tail.
Hence, in this case, the correct answer is option D. "They are so close to the sun that they orbit every six months."
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