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๐ช Journey Through the Solar System
Explore the planets in real time – select a world, adjust its speed, and watch it glide around the Sun. Use the orbit simulation, calculate your weight on other worlds using NASA’s official gravity ratios, and explore detailed profiles of every planet backed by leading space agencies.
⚖️ Your Weight on Other Planets
This calculator uses the official surface gravity ratios published by NASA's Planetary Fact Sheets. Enter your Earth weight and pick a destination.
๐ช Complete Guide to All Eight Planets
Our solar system contains four rocky inner planets and four giant outer worlds. Each planet holds unique secrets revealed by decades of exploration. Below you’ll find concise profiles of every official planet, from sun‑scorched Mercury to distant, stormy Neptune.
☄️ Mercury: The Extreme, Scorching Speedster
As the smallest planet and closest to the Sun, Mercury experiences wild temperature swings. NASA’s MESSENGER mission revealed its heavily cratered surface. Learn more on the
Size & Orbit: Only slightly larger than Earth's Moon, it orbits the Sun in just 88 Earth days.
The Longest Days: A single solar day lasts about 176 Earth days.
Surface: Cratered with virtually no atmosphere, only a thin exosphere.
Temperatures: 430°C (800°F) by day, -180°C (-290°F) at night.
☁️ Venus: Earth’s Evil Twin
Venus is Earth's twin in size but a runaway greenhouse world. The ESA Venus Express mission mapped its thick atmosphere. Explore deep planetary insights on the
Greenhouse Effect: Carbon dioxide atmosphere with sulfuric acid clouds traps heat.
Retrograde Rotation: Spins backward; the Sun rises in the west.
Surface Temperature: A constant 465°C (900°F).
๐ Earth: The Living Blue Marble
Our home planet, Earth, lies in the habitable zone. The
Atmosphere: 78% nitrogen, 21% oxygen.
Water World: 71% covered by water.
Active Geology: Tectonic plates and a protective magnetic field.
๐ด Mars: The Rust-Colored Frontier
Mars is the Red Planet, home to Olympus Mons. NASA’s Curiosity rover and the
Red Dust: Iron oxide (rust) gives Mars its color.
Extreme Geography: Olympus Mons (3× Everest) and Valles Marineris.
Thin Atmosphere: About 1% of Earth's, mostly carbon dioxide.
♃ Jupiter: King of the Planets
The largest planet, Jupiter, contains more mass than all other planets combined. Its Great Red Spot and dynamic atmosphere have been studied by NASA’s Juno mission. The gas giant has at least 95 known moons, including the ocean world Europa.
- Size & Composition: 11 Earths wide, mostly hydrogen and helium.
- Great Red Spot: A storm larger than Earth persisting for centuries.
- Moons: Io, Europa, Ganymede, Callisto are the four largest.
♄ Saturn: The Ringed Wonder
Saturn is famous for its stunning ring system. The Cassini spacecraft spent 13 years studying the planet, its rings, and moons. Titan, Saturn’s largest moon, has a thick atmosphere and liquid methane lakes.
- Rings: Made of ice and rock particles, spanning thousands of miles.
- Density: Saturn is the only planet less dense than water.
- Wind Speeds: Up to 1,800 km/h (1,100 mph) in the upper atmosphere.
⛢ Uranus: The Sideways Ice Giant
Uranus rotates on its side, likely due to a massive ancient collision. Discovered in 1781, it is an ice giant with a blue‑green hue caused by methane. The Voyager 2 flyby remains our only close encounter.
- Tilt: Axial tilt of 98°, causing extreme seasonal changes.
- Composition: Water, methane, and ammonia ices above a rocky core.
- Rings & Moons: 13 known rings and 27 moons, including Miranda with its bizarre terrain.
๐ต Neptune: The Windy, Deep-Blue Giant
The most distant planet, Neptune, has the strongest sustained winds in the solar system. Its dynamic atmosphere was captured by Voyager 2 in 1989. The planet’s largest moon, Triton, orbits backward and may harbor a subsurface ocean.
- Wind Speed: Up to 2,100 km/h (1,300 mph).
- Great Dark Spot: A transient storm similar to Jupiter’s Great Red Spot.
- Moons: 16 known moons; Triton is geologically active.
๐ Quick Comparison: All Eight Planets
๐ Beyond the Planets: Moons, Asteroids, and Deep Space
Beyond Neptune lies the Kuiper Belt, home to dwarf planets like Pluto. NASA’s New Horizons mission transformed our view of this distant region. Asteroids and comets, studied by missions such as OSIRIS‑REx and Rosetta, provide clues to the early solar system.
The search for life beyond Earth focuses on ocean moons like Europa and Enceladus. For the latest discoveries, visit the NASA Solar System Exploration page.
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