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This is a graph with density (g/cm3) on the y-axis. On the x-axis there are the planets Mercury, Venus, Earth and Mars (grouped as terrestrial planets), Jupiter, Saturn, Uranus and Neptune (grouped as giant planets), Moon, Triton, Enceladus and Hyperion (grouped as moons), and Vesta, grouped as an asteroid. There are red lines running horizontally across the graph, the top one being iron, the middle one being rocks, and the bottom one water.