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Solar System
Click any planet or the Sun to explore
Quick fact:
A year on Neptune lasts about 165 Earth years.
Beyond Neptune
Pluto
Dwarf Planet · Kuiper Belt - Discovered 1930; reclassified 2006. Has heart-shaped Tombaugh Regio and five known moons.
Ceres
Dwarf Planet · Asteroid Belt - Largest object in the asteroid belt; visited by NASA's Dawn spacecraft (2015).
Eris
Dwarf Planet · Scattered Disc - Slightly smaller than Pluto but more massive - helped prompt the dwarf-planet definition.
Solar System FAQ
How many planets are in our Solar System?
Eight planets orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto is a dwarf planet.
Which planet is the hottest?
Venus has the hottest surface - about 465°C on average - due to a thick greenhouse atmosphere, not Mercury.
What is the largest planet?
Jupiter is the largest planet - more than 11 times Earth's diameter and 300 times its mass.
Can I take a quiz about planets?
Yes. Click any planet on our Solar System map to open facts, NASA images, and a free science quiz.