The Solar System: All 8 Planets in Interactive 3D

Our solar system is a vast, dynamic collection of objects bound together by the Sun's gravity. At its center is the Sun — a star containing 99.86% of all the solar system's mass. Orbiting it are 8 planets, 5 officially recognized dwarf planets, hundreds of moons, millions of asteroids, and billions of comets. The solar system formed about 4.6 billion years ago from a collapsing cloud of gas and dust.

The 8 Planets: Quick Reference

Mercury

Diameter: 4,879 km (0.38× Earth) · Distance from Sun: 0.39 AU · Orbital period: 88 days · Moons: 0. The smallest planet and the one closest to the Sun. Despite this, Mercury is NOT the hottest planet — its lack of atmosphere means it can't retain heat. Surface temperatures swing from -180°C at night to 430°C during the day.

Venus

Diameter: 12,104 km (0.95× Earth) · Distance from Sun: 0.72 AU · Orbital period: 225 days · Moons: 0. Earth's "twin" in size but radically different in every other way. A runaway greenhouse effect has made it the hottest planet (465°C on average). A day on Venus (243 Earth days) is longer than its year, and it rotates backwards.

Earth

Diameter: 12,742 km · Distance from Sun: 1 AU · Orbital period: 365.25 days · Moons: 1. The only known planet with life, liquid water on its surface, and a biosphere. Earth's large Moon helps stabilize its axial tilt, keeping the climate relatively stable over geological timescales.

Mars

Diameter: 6,779 km (0.53× Earth) · Distance from Sun: 1.52 AU · Orbital period: 687 days · Moons: 2 (Phobos, Deimos). The most explored planet after Earth, with multiple rovers and landers studying its surface. Mars has the largest volcano (Olympus Mons) and the largest canyon (Valles Marineris) in the solar system. Evidence strongly suggests it once had liquid water and may still have it below the surface.

Jupiter

Diameter: 139,820 km (11× Earth) · Distance from Sun: 5.2 AU · Orbital period: 12 years · Moons: 95. The solar system's largest planet — so massive it pulls comets and asteroids away from the inner planets, possibly protecting Earth. Its Great Red Spot is a storm three times the size of Earth that has persisted for centuries. Jupiter's moon Europa may harbor life in its subsurface ocean.

Saturn

Diameter: 116,460 km (9× Earth) · Distance from Sun: 9.5 AU · Orbital period: 29.5 years · Moons: 146. Famous for its spectacular ring system spanning 282,000 km but only ~100 m thick. The least dense planet — it would float on water. Its moon Titan is the only moon with a thick atmosphere and liquid seas on its surface.

Uranus

Diameter: 50,724 km (4× Earth) · Distance from Sun: 19.2 AU · Orbital period: 84 years · Moons: 28. The most tilted planet — it rotates on its side with an axial tilt of 98°, likely the result of a giant impact. Its blue-green color comes from methane absorbing red light. Has 13 known rings.

Neptune

Diameter: 49,244 km (3.9× Earth) · Distance from Sun: 30 AU · Orbital period: 165 years · Moons: 16. The farthest planet from the Sun and the windiest place in the solar system — supersonic winds up to 2,100 km/h. Its largest moon Triton orbits backwards (retrograde), suggesting it was captured from the Kuiper Belt.

The Structure of the Solar System

• Inner Solar System: Four terrestrial (rocky) planets — Mercury, Venus, Earth, Mars
• Asteroid Belt: A ring of rocky debris between Mars and Jupiter's orbits
• Outer Solar System: Four giant planets — Jupiter, Saturn, Uranus, Neptune
• Kuiper Belt: Icy bodies from 30–50 AU, including Pluto and other dwarf planets
• Oort Cloud: A vast spherical shell of comets extending up to 100,000 AU — the true gravitational edge of the solar system

How Old Is the Solar System?

The solar system formed approximately 4.568 billion years ago from the gravitational collapse of a giant molecular cloud, likely triggered by the shockwave from a nearby supernova. The Sun formed first at the center, while remaining gas and dust flattened into a protoplanetary disk from which the planets gradually accreted. The heavy bombardment period (4.1–3.8 billion years ago) shaped the final form of the inner planets, and life on Earth emerged about 3.8 billion years ago.