This visualization compares temperature ranges on Earth and Mars using vertical scales and colored bars, with labeled markers for average, maximum, and minimum temperatures alongside planet icons. The dark background and planet circles frame the data prominently. The code uses D3 v4 selections and SVG primitives (`append`, `attr`) to construct all elements manually, reading no external data file despite the presence of `data.csv`. Temperature values are positioned via hard-coded pixel offsets and spacing constants, with white tick marks and pointer rectangles indicating specific measurements.