Cosmology is the study of the origins and evolution of the universe, while a doctor typically refers to a medical professional. If you're interested in combining these fields, you might consider a career in astrophysics or space medicine, where you could study the effects of space on the human body or explore cosmic phenomena. To pursue such a career, you would generally need to obtain relevant education, such as a degree in physics, astronomy, or medicine, followed by specialized training or further education in your chosen field.