Two Links Double Pendulum vs Hellios

Two Links brings one of physics' most beautiful chaotic systems to life. Watch a double pendulum swing, twist, and spiral in real-time 3D — then place it on your floor in Augmented Reality and walk around it. Features • Real-time double pendulum physics (RK4 integration) • AR mode — anchor the pendulum on any flat surface • Orbit the 3D scene freely or let it run hands-free • Adjust link length, pivot position, density, and color • Particle trail from the second link tip • Night sky environment with the Moon and Earth • Pause, shuffle, and watch the chaos reset

How much time is left before our star swells into a red giant? Solar Countdown turns billions of years of stellar evolution into a story you can explore in minutes. Travel from the Sun’s “right now” to its distant future. Each stop on the timeline pairs gorgeous space visuals with clear, bite-sized explanations - what happens to the Sun, and what it could mean for Earth. What you’ll explore • Interactive timeline from the present day to the red-giant phase • Milestones explained in plain English (main sequence stability, warming Sun, magnetosphere changes, ocean loss, and more) • Big-picture countdown that makes cosmic time feel tangible • Beautiful animations and high-contrast space art that bring each era to life • Science-based estimates with approachable context - great for students, teachers, and space fans Whether you’re prepping a class, feeding a curiosity rabbit hole, or love beautiful space apps, this is a quick, captivating way to see our star’s future.