Living Earth vs Three

The planet, live: every earthquake ripples where it struck, hurricanes spin with their real forecast tracks, wildfires burn, volcanoes glow, and the aurora dances over the poles — all on a beautiful 3D globe, straight from USGS, NOAA, NASA, and the Smithsonian. Tap anything for its story. A quake card shows the actual USGS ShakeMap and what its magnitude really means. A hurricane card shows the storm photographed from orbit minutes ago. Every one of 1,214 volcanoes carries its photo and geologic history. THE LIVING GLOBE • Live earthquakes, sized and colored by magnitude, rippling as they arrive • Hurricanes and tropical storms with NOAA's forecast track • Wildfires tracked from orbit by NASA • The aurora oval, forecast by NOAA and animated like the real thing • 1,214 volcanoes from the Smithsonian's catalog — recent eruptions glow • Tectonic plate boundaries: flip them on and the quakes explain themselves REPLAY THE WEEK Scrub through the past seven days and watch 400 earthquakes strike in sequence — the Ring of Fire literally draws itself. BENEATH YOU Which tectonic plate are you standing on? How far is the nearest plate boundary? Your nearest volcano? The week's quakes around you? One tap answers, computed entirely on your device. QUAKE ALERTS Optional notifications for significant earthquakes near you and major ones worldwide — no account, nothing sent anywhere. GUIDED TOURS The Ring of Fire in eight stops, and Legendary Earth — Vesuvius, Tambora, the 1960 M9.5, the dinosaur-killing impact, and more — each with real photography. TODAY ON EARTH The planet's day in one glance, on a widget too. Share any event as a poster. All data comes from public scientific agencies: USGS, NOAA, NASA, and the Smithsonian Institution. No account. No tracking. Your location never leaves your device.

Three bodies. Countless paths. Watch the beauty of gravity unfold. Three-Body Simulation brings abstract celestial motion into a world of orbits you can watch, interact with, and explore. See three bodies pull on one another as their trails gradually draw patterns, and discover how a simple law of gravity produces rich and fascinating motion. Explore 16 classic periodic solutions From the flowing Figure Eight to Butterfly, Moth, and Bumblebee, discover the shapes and rhythms of different periodic solutions. Detailed introductions to each orbit explain the motion behind these patterns. Discover 10,059 three-dimensional periodic orbits Explore published spatial periodic solutions and discover paths that weave and curve through space. Choose an orbit by number or discover one at random, then rotate the view to see its shape from different directions. Try your own gravity experiment Adjust the mass, initial position, and velocity of each body and watch how the orbit changes. You can also explore random three-body motion to see how the bodies approach, circle, and move away from one another. Turn curiosity into understanding Learn about the origins, history, and basic principles of the three-body problem. See the full system of three equations of motion, explore classic periodic solutions, and learn how the 10,059 spatial periodic orbits were discovered. Let the paths you see become a starting point for understanding gravity and motion. Available on iPhone and iPad in ten languages, including Chinese, English, and Japanese. Orbit data, simulations, and introductions are included in the app, so the core exploration experience works offline. The complete orbit catalog, random motion, and custom experiments are unlocked with a one-time in-app purchase.