This animation visualizes the relative sizes of the Sun and planets in the solar system, using circles scaled proportionally to each body’s radius. Data from Wikipedia drives the layout, with distances not to scale and labels positioned below each circle. The code uses D3’s `select`, `transition`, and `easeLinear` APIs to animate the circles growing from zero and fading in labels sequentially. A simple black background and solid color fills keep the illustration clear, while the fork invites adding SVG gradients for more realistic planetary textures.