Exoplanet Population Map 2D: Mass-Radius Classifier

This 2D companion drives the same physics as the 3D exoplanet classifier — bulk density computed as mass divided by radius cubed, and the same threshold rules astronomers use to sort worlds into terrestrials, super-Earths, mini-Neptunes, ice giants, gas giants and hot Jupiters — but replaces the rendered sphere with a live population map. A synthetic set of roughly 370 planets, seeded to mirror the real Kepler/TESS mass-radius distribution (a rocky pile-up near Earth's size, a thin "radius valley" gap around 1.5-2 Earth radii, a mini-Neptune bump above it, and a long gas-giant tail), sits in the background so your planet's point never floats in isolation. Move the sliders to reshape your planet and watch it settle among its real-world analogues, then check the nearest-neighbour readout to see which corner of the diagram it lands closest to.