Physics runs live: RK4 world motion for Earth, Sun, Moon, planets, and black holes, with Earth-local high-precision ship dynamics for launch, landing, and atmosphere. All seven planets are in, true radii and μ, each with its own SOI; you can land on the rocky ones. Exponential Earth atmosphere below 160 km. Black holes are real point masses (μ = r_s·c²/2) with the Paczyński–Wiita potential for ISCO and capture. The river view follows v = √(2μ/r) and uses a small visual core for tiny holes so their local direction stays readable. Dark energy adds the physical ΛCDM a = ΩΛH₀²r term, visible from stellar-balance scale upward, and Shift+O adds the Milky Way dark-matter halo. Cosmic scale adds HYG real-star catalog points with estimated mass/radius/luminosity/temperature, generated world-space stars, nearby named stars, the Milky Way disk, Andromeda, Triangulum, and Local Group dwarf bodies. Nearby named stars and a capped HYG physical subset are destinations with true light-year 3D RA/declination positions, photosphere contact, and gravity in the live field. Holes and planets move through the live n-body field. Drag to orbit the camera, scroll to zoom. Aim for the Moon, capture orbit, land, come home — or dive into something dark.