Mercury, the smallest planet, in enhanced colour from MESSENGER Planets Mercury: The Smallest Planet Mercury is the smallest planet and closest to the Sun. Learn Mercury's extremes of heat and cold, its cratered surface, and how to spot it from your backyard.
Mars, the red planet, imaged by the Hubble Space Telescope Planets Mars: The Red Planet Mars is the red planet backyard astronomers chase hardest. Learn about Mars, its oppositions, polar caps and surface detail — and how to observe it.
Saturn Planets Saturn: 10 Fascinating Facts About the Ringed Planet (2026) Explore the wonders of Saturn and its moons with our comprehensive guide. Dive into detailed analyses, stunning images, and the latest discoveries
Jupiter Planets Jupiter: Earth's Cosmic Bodyguard — Facts, Moons and Storms (2026) Jupiter is the solar system's giant — heavier than all other planets combined and Earth's cosmic bodyguard. Facts, moons, storms, and how to observe Jupiter.
