Science

Planets & Moons of Our Solar System

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Updated:3/6/2026
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Body
Type
Orbits
Diameter (km)
Why It's Fascinating
Earth
Rocky PlanetSun12,742The only known life-bearing world, 71% water, perfect goldilocks zone, pale blue dot, our everything
Mars
Rocky PlanetSun6,779Red Planet, Olympus Mons (tallest volcano), Valles Marineris canyon, Perseverance rover, Elon's obsession
Jupiter
Gas GiantSun139,820Could fit 1,321 Earths inside, Great Red Spot storm (400 years!), 95 moons, protects Earth from asteroids
Saturn
Gas GiantSun116,460Those RINGS (ice and rock, only 10m thick), would float in water (less dense), hexagonal polar storm
Europa
MoonJupiter3,122Ocean under ice shell, more water than Earth's oceans, best candidate for alien life, NASA Europa Clipper mission
Titan
MoonSaturn5,150Thick atmosphere (only moon with one), methane lakes and rain, Dragonfly drone mission, potential prebiotic chemistry
Venus
Rocky PlanetSun12,104Earth's evil twin, 900°F surface, sulfuric acid clouds, rotates backwards, once had oceans (maybe)
Mercury
Rocky PlanetSun4,879Closest to Sun, 800°F days / -290°F nights, iron core is 85% of its radius, shrinking as it cools
Neptune
Ice GiantSun49,5282,000 km/h winds (fastest in solar system), beautiful blue from methane, dark spots come and go
Uranus
Ice GiantSun50,724Tilted 98° (rolls around the Sun), diamond rain inside, 27 moons named after Shakespeare characters
Enceladus
MoonSaturn504Shoots water geysers into space, subsurface ocean, organic molecules found, tiny but a top alien life candidate
Io
MoonJupiter3,643Most volcanically active body in solar system, 400+ volcanoes, tidal heating from Jupiter, hellscape surface
Pluto
Dwarf PlanetSun2,377Demoted in 2006 (still controversial), heart-shaped glacier (Tombaugh Regio), New Horizons flyby was emotional
Ganymede
MoonJupiter5,268Largest moon in solar system (bigger than Mercury), own magnetic field, subsurface ocean, JUICE mission target
The Moon (Luna)
MoonEarth3,474Controls our tides, 12 humans walked on it, 'giant impact' origin theory, Artemis is going back

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