{"knowledge_schema": {"broad_category": "Astronomy \u2192 Exoplanets \u2192 Planetary Density", "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 greatest density by analyzing their mass relative to their size and composition.", "goal": "Identify the exoplanet with the highest density among the provided candidates."}, "summary": "In this problem, we are tasked with comparing the densities of various exoplanets based on their mass and composition. The candidates include planets with different masses and similar compositions to Earth. To determine which planet has the greatest density, we consider that density is mass divided by volume. A planet with five times Earth's mass and similar composition (candidate c) is likely to have a greater density than the others, as it would have a smaller volume-to-mass ratio compared to the others, leading to a higher density."}