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Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, Clyde Tombaugh's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially named the ninth planet.
In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, resulting in a brief search for a tenth planet.
Today women can certainly take care of themselves, but the e...
This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit.
As relationships continue to evolve and change, the needs and wants of women change with them.
Thousands of years ago, a woman would depend on a man to provide her physical needs, such as food and shelter, for her and her children’s survival.
These were regarded by many early cultures as divine, or as emissaries of deities.
As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects.