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When is the tail of a comet the shortest?

Answer 1

Comets are icy bodies..Tail is formed by sublimated icy matter in the comet.![enter image source here]
Picture credit ICY ogt

The icy materials, such as water, carbon dioxide, ammonia, etc., turn into vapor only after receiving heat from the sun. The tail is shortest when the animal is far from the sun. The tail develops only when the animal gets close to the sun.

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Answer 2

Elena Antonova

Due to increased solar wind and radiation pressure, a comet's tail shortens when it gets closest to the sun.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.