It doesn't.
A planet cannot become a star. A star is an object that is massive enough to release energy via nuclear fusion. A planet is much less massive.
No. Neptune is a gas giant planet. There is no way it could be reclassified as a dwarf planet.
Since Pluto is no longer considered a planet, mercury has become the smallest planet.
This is how u spell the planets in order Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
No one knows for sure yet. Some day Mercury can become a drawf planet because of how small it is. If Mercury does become a drawf planet Mars is probably next.
Pluto may become a major planet again in a few million years, if it clears it's orbit of asteroids and other debris.
Yes, a dwarf planet can become a moon if it is captured by the gravitational field of a larger planet. This process can happen when a dwarf planet gets close enough to a planet and is pulled in by its gravity. Once captured, the dwarf planet would then orbit the larger planet as one of its moons.
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Planet Fitness
The distinction of a dwarf planet is not based on size. A dwarf planet is a planet-like object that has not cleared its path of debris and become gravitationally dominant.
The IAU arrived at a new definition for "planet" which left Pluto out in the cold. It is now designated as a "Dwarf Planet". also it was called a planet when is was larger but now it has become smaller scientists no longer class it as a planet