Mars is a dusty, cold, desert world with a very thin atmosphere. There is strong evidence Mars was billions of years ago wetter and warmer, with a thicker atmosphere.
Mars
The Red Planet
Mercury the smallest planet in our solar system and closest to the Sun is only slightly larger than Earth's Moon. Mercury is the fastest planet, zipping around the Sun every 88 Earth days.
Mercury
The Swiftest Planet
Venus spins slowly in the opposite direction from most planets. A thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system.
Venus
Planetary Hot Spot
Jupiter is more than twice as massive than the other planets of our solar system combined. The giant planet's Great Red spot is a centuries old storm bigger than Earth.
Jupiter
Twice as massive as all the other planets combined
Pluto is a complex world of ice mountains and frozen plains. Once considered the ninth planet, Pluto is the best known of a new class of worlds called dwarf planets.
Pluto
Dwarf Planet