Explore the icy edge of the solar system beyond Neptune. This interactive Kuiper Belt simulation places thousands of Kuiper Belt Objects (KBOs) in a torus-shaped belt, with a highlighted population locked into Pluto's famous 3:2 orbital resonance with Neptune.
Every KBO obeys Kepler's third law: orbital angular speed falls off as r-1.5, so distant objects crawl while inner ones sweep around faster. A subset of KBOs — the Plutinos — orbit at 1.31× Neptune's distance, completing exactly 2 orbits for every 3 Neptune completes, a stable mean-motion resonance that has shepherded Pluto safely for billions of years.
Drag to pan and scroll to zoom the belt. Adjust KBO count and belt width to reshape the torus, tune orbital speed to speed up or slow the simulated years, and toggle the 3:2 resonance highlight to see Plutino objects glow orange along their shared orbital radius.
The Kuiper Belt contains over 100,000 known objects larger than 100 km, including dwarf planets Pluto, Eris, Makemake and Haumea. It is the source of most short-period comets, which get gravitationally nudged inward toward the Sun over millions of years.
This Kuiper Belt simulation renders a top-down view of the outer solar system, placing thousands of icy Kuiper Belt Objects (KBOs) in a torus beginning just beyond Neptune's orbit at 30 astronomical units (AU). Each object's angular velocity is derived from Kepler's third law, so bodies further from the Sun orbit proportionally slower. A configurable fraction of the population sits in the 3:2 mean-motion resonance with Neptune — the same resonance that governs Pluto and the "Plutino" family — and can be highlighted in a contrasting colour.
Kuiper Belt Objects are icy remnants from the solar system's formation, orbiting the Sun beyond Neptune. Their orbital speed decreases with distance following Kepler's third law (T² ∝ r³), and gravitational resonances with Neptune — particularly the 3:2 resonance — trap large populations of objects, including Pluto itself, into stable long-term orbits.
Drag to pan the view and scroll (or use the Zoom slider) to zoom in and out. KBO count sets the total population size, Belt width controls how spread out the torus is, Orbital speed scales simulated time, and the resonance toggle highlights Plutino-like objects locked at 1.31× Neptune's orbital radius.
New Horizons became the first spacecraft to explore the Kuiper Belt up close, flying past Pluto in 2015 and the small KBO Arrokoth in 2019 — the most distant object ever visited by a spacecraft.
The Kuiper Belt is a disc-shaped region of icy bodies beyond Neptune's orbit, extending roughly from 30 to 50 AU from the Sun. It contains hundreds of thousands of objects larger than 100 km, including the dwarf planets Pluto, Eris, Makemake and Haumea, and is thought to be a relic of the solar system's early formation.
An orbital resonance occurs when two bodies' orbital periods form a ratio of small integers. Pluto completes exactly two orbits for every three that Neptune completes, meaning their gravitational interactions repeat in the same pattern and never build up enough to destabilise Pluto's orbit, even though its path crosses inside Neptune's. Objects sharing this resonance are called Plutinos.
Kepler's third law states that the square of an orbital period is proportional to the cube of its semi-major axis. In practice this means objects farther from the Sun move much more slowly — an object at 50 AU takes roughly 354 years to orbit, compared with Neptune's 165 years at 30 AU.
Yes. Gravitational perturbations, including close encounters with Neptune, occasionally knock KBOs onto orbits that dive into the inner solar system. Many short-period comets (with orbital periods under 200 years) originate from the Kuiper Belt's scattered disc population.
The asteroid belt lies between Mars and Jupiter and consists mainly of rocky and metallic bodies. The Kuiper Belt is roughly 20 times wider and 20 to 200 times more massive, made up of icy bodies rich in frozen methane, ammonia and water, and located far beyond Neptune in the cold outer solar system.