This visualization shows the relationship between gravity and average temperature for planets, with each point colored by planet category. Users can hover over a dot to view a tooltip with the planet’s name, category, and exact gravity and temperature values. The chart is built as a reusable scatter-plot factory using D3 v7, employing d3.scaleLinear, d3.extent, d3.axisBottom, d3.axisLeft, d3.schemeTableau10, and d3.least for nearest-point detection. Rendering uses SVG circles inside a joined `<g>` element, with axes and labels appended directly.