Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
A hypothetical method of decay for these particles involves breaking into a positron and a neutral pion and would have a half-life on the order of 10 to the 35 years. In astronomy, these particles are employed in a namesake chain located in the cores of stars in order to synthesis lighter elements. Particles of this type are typically composed of two up quarks and a single down quark and these particles make up about 90% of all cosmic rays. Discovered by Ernest Rutherford, for 10 points, identify this subatomic particles that contributes the positive charge of an atoms nucleus.
A:
Science