Suggest why the distance between the Sun and each planet is relatively constant, but the distances between planets changes constantly ?

The distance between the Sun and each planet remains relatively constant because each planet orbits the Sun in a specific path, known as an orbit. This orbit is determined by the gravitational pull of the Sun, which keeps the planet in a relatively stable and predictable path.

On the other hand, the distances between planets change constantly because each planet is moving along its own orbit at its own speed. For example, while Earth completes an orbit around the Sun in about 365 days, Mars takes about 687 days to do the same. This means that the relative positions of Earth and Mars - and therefore the distance between them - is constantly changing as they both move along their respective orbits.

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