This visualization plots confirmed exoplanets by mass (y-axis) against their star’s habitable zone distance (x-axis), with circle size encoding radius and color encoding temperature regime (too hot, just right, too cold). Built with React and D3 v5, it uses `scaleLinear` and `scaleLog` for the y-axis with toggle buttons, `scaleThreshold` for color, and `scaleLinear` for both x and radius scales. SVG circles render from a CSV, with custom `AxisLeft` and `AxisTop` components.