{"knowledge_schema": {"broad_category": "Astronomy \u2192 Stellar Composition \u2192 Elemental Abundances", "refinement": "This problem involves calculating the relative abundances of silicon in two stars based on their elemental ratios and the solar composition.", "specific_scope": "The focus is on determining the ratio of silicon atoms in the photospheres of two stars, given their elemental abundances and the solar reference values.", "goal": "Calculate the ratio of silicon atoms in the photospheres of Star_1 and Star_2 using the provided elemental abundance data."}, "summary": "This problem requires understanding stellar composition and elemental abundances to calculate the ratio of silicon atoms in two stars. By using the given elemental abundance ratios and the solar composition as a reference, we can derive the relative amounts of silicon in the photospheres of Star_1 and Star_2. The goal is to find this ratio, which is determined to be 12.6."}