🪐 Planet Facts & Quiz
All 8 planets · Size comparisons · Fun facts · Interactive quiz · Grades 2–6
☀️ Inner Planets (Rocky)
MercurySmallest planet, closest to Sun. No atmosphere — days reach 800°F, nights drop to -290°F!
VenusHottest planet (900°F!) due to thick CO₂ atmosphere. Rotates backwards. Often called Earth's 'twin' by size
EarthOnly known planet with liquid water and life. One moon. Tilted axis gives us seasons
MarsThe 'Red Planet' — iron oxide (rust) colors its surface. Has the tallest volcano in the solar system: Olympus Mons
💨 Outer Planets (Gas & Ice Giants)
JupiterLargest planet — you could fit 1,300 Earths inside! Great Red Spot is a storm bigger than Earth, raging for 300+ years
SaturnFamous for its rings (made of ice and rock). So light it would float in water! Has 146 known moons
UranusTilted on its side (98°) — it rolls around the Sun! An ice giant with methane atmosphere that makes it blue-green
NeptuneFarthest planet from Sun. Winds reach 1,200 mph — the fastest in the solar system. Deep blue color from methane
🎯 Quiz Time!
⭐ 0Q 1/5
Learning About the Planets
The eight planets of our solar system offer endless fascination for young learners. From Mercury's extreme temperature swings to Neptune's supersonic winds, each planet has unique characteristics that teach kids about gravity, atmosphere, temperature, and the scale of our cosmic neighborhood.
This interactive tool presents key facts about all eight planets organized by inner (rocky) and outer (gas/ice giant) groups, with a quiz to reinforce learning. Aligned with NGSS ESS1 standards for grades 2–6.
Last reviewed: April 2026
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