{"knowledge_schema": {"broad_category": "Astronomy \u2192 Exoplanets \u2192 Density Calculations", "refinement": "This problem involves comparing the densities of different exoplanets based on their mass and composition.", "specific_scope": "The focus is on determining which of the given exoplanets has the highest density by analyzing their mass and volume relationships.", "goal": "Identify the exoplanet with the highest density among the provided options."}, "summary": "This problem requires understanding the concept of density, which is mass divided by volume. We need to compare the densities of four different exoplanets based on their mass and size. The planet with the same composition as Earth but 5 times more massive (option c) will have a smaller volume-to-mass ratio compared to the others, leading to a higher density. Thus, the answer is that the planet with 5 times the mass of Earth has the highest density."}