Rogue Planet Cooling Track & Detection Curve

This is a 2D-native companion to the 3D rogue planet infrared glow detector. Instead of watching a single glowing sphere drift through a starfield, this view plots the same Kelvin–Helmholtz cooling physics the way astronomers actually chart it: a luminosity-vs-age cooling track (isochrone diagram) on log–log axes, with the current mass's track highlighted against a few reference masses, and a live marker showing exactly where the planet sits as it ages and fades. A second panel plots apparent magnitude against distance, with the chosen survey telescope's detection limit drawn as an explicit horizontal line — so instead of reading a single pass/fail verdict, you can see the whole trade space and exactly how far the crossing point would need to move for a planet to become detectable (or drop out of range). Adjust mass, age and distance, and switch telescopes, to watch both curves and their thresholds respond together.