Regarding how complicated a field of study is depends on the individual. Something being complicated or not complicated is subjective (based on or influenced by personal feelings, tastes, or opinions). Gravity can be simplified to "mass attracts mass" or complex when you consider the mathematics behind the forces (i.e., Newton's law of gravity and other related formulas); however, complexity is also subjective, based on the individual learning about the subject at hand, based on many factors about the individual to include their desire to learn, math skills, and other matters.
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