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Learning path

The Solar System

A guided tour of the Sun and the worlds that orbit it — planets, moons, small bodies, and the missions that explore them, all built on real NASA data.

Beginner
  1. 1.1What is the Solar System?The Sun and everything gravitationally bound to it.
  2. 1.2The eight planetsFrom Mercury to Neptune, in order from the Sun.
  3. 1.3The inner, rocky planetsMercury, Venus, Earth, and Mars.
  4. 1.4Earth's MoonOur nearest neighbour in space.
Intermediate
  1. 2.1Gas giantsJupiter and Saturn — the largest planets.
  2. 2.2Ice giantsUranus and Neptune.
  3. 2.3Moons of the planetsFrom tiny Phobos to giant Ganymede.
  4. 2.4Dwarf planetsPluto, Ceres, Eris, Haumea, and Makemake.
Advanced
  1. 3.1AsteroidsRocky remnants of the early Solar System.
  2. 3.2CometsIcy visitors from the outer Solar System.
  3. 3.3Planetary missionsHow we explore other worlds.
  4. 3.4Mars — a world exploredThe most-visited planet beyond Earth.

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Understanding Stars →