This animated visualization displays the relative sizes of the Sun and planets in the solar system, using circles positioned along a horizontal line, with distances not to scale. Each celestial body appears sequentially, expanding from a radius of zero to its proportional size, with labels fading in beneath. The code uses D3.js transitions with `transition.attr` to animate the circle radii and text opacity, driven by data from Wikipedia’s list of gravitationally rounded objects. SVG circles and text elements are bound to the dataset, with a black background and distinct fills for each planet.