Suppose that two small masses move around the Sun in the same elongated orbit, but that one is slightly ahead of the other.

Suppose that two small masses move around the Sun in the same elongated orbit, but that one is slightly ahead of the other. How will their mutual distance change with a change in their position in orbit? Does this provide a hint of an explanation for the size changes of cometary heads?

From aphelion to perihelion, the distance between particles will grow, and vice versa.

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