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There is a lot of debate about whether Pluto is really a planet or not. Since its discovery in 1930 by astronomer Clyde W. Tombaugh, Pluto has been assigned the rulership of Scorpio. The mysterious nature of this distant object, the way it continues to confound attempts to see it closely, and its lonely position as the outpost to the galaxy, are Scorpionic in nature.
In addition, its discovery coincided with some decidedly Scorpionic events. Pluto orbits the sun approximately every 248 years, so it is a "generational" planet. It necomes a personal planet in the chart if it is aspected by one of the inner planets.