Category:Science is a meta category which should not have individual pages attached to it. Rather it serves to organize other categories. The only categories which should belong to this one are those that define the broad subjects of scientific enquiry, such as Category:Astronomy, Category:Mathematics, Category:Physics and the like.
If you are looking for categories relevant to the individual practitioners of these fields of study (astronomers, mathematicians, physicists), please see the relevant subcategory of Category:Individuals by profession — generally, Category:Scientists.
This category has the following 18 subcategories, out of 18 total.