Interstellar: Ad Astra

What if understanding a black hole began with a journey, rather than a diagram? Interstellar: Ad Astra is an open-source, Interstellar-inspired browser mission built with GPT-6 Astra. It combines a Kerr black-hole renderer with a human-scale story: give a crewmate the return seat, release your probe, and take the descent. Change your viewpoint, watch gravitational lensing respond, switch between cabin and exterior views, and steer through a debris encounter. The exterior optics numerically integrate general-relativistic light paths; the probe follows a timelike geodesic. Progressive refinement and cached transport maps put this on the viewer’s GPU through WebGL2, with no server GPU required. Our aim is to make fundamental physics something people can explore on hardware they already own. This is a reduced-scope prototype, not film-equivalent rendering: the physical model stops outside the horizon, and the memory-space finale is explicitly speculative fiction.