Solar System Explorer
Tap a world on the map or in the list. Read the deep-dive card — size, distance, moons, atmosphere — then try the quiz.
This map is a learning picture — sizes and distances are not to real scale. In space, gaps between planets are enormous.
Asteroid belt
Planet 3 from the Sun · Our home
Earth is the only planet we know with abundant liquid water on the surface and life. Its atmosphere, magnetic field, and distance from the Sun make it a Goldilocks world.
~12,740 km
~150 million km (1 AU — the “astronomical unit”)
Just right for liquid water in many places
Nitrogen & oxygen — protects us and makes weather
1 (the Moon)
Rocky planet with oceans, continents, and a magnetic field
Compare
Earth is the densest of the eight planets.
Deep facts (1/4)
About 71% of Earth’s surface is covered by ocean.
Day: ~24 hours
Year: ~365.25 days
Tap a world