Cosmetology is the field of hair styling, manicures, make-up, etc. Training in that field is usually done at a "beauty" school.
Did you mean Cosmology? Cosmology is the study of the origins of the universe (the cosmos) and is usually part of an Astronomy department at a university. You would need to study math and physics if you are interested in Planetary Science/Astronomy.
Also, it teaches you how to approach problems in an analytical way; how to break down problems to smaller steps to solve them. That is a good lesson for life.
If you meant Cosmetology, look up "The Golden Ratio: Phi, 1.618" Math and beauty.