The Planets
Tap a planet to learn about it
⚖️ How Much Would You Weigh?
Gravity is different on every planet, so your weight would change too — even though how much "stuff" you're made of (your mass) stays the same!
🎂 How Old Would You Be?
A "year" is just how long a planet takes to go around the Sun once — planets farther out take much longer!
Solar System Tips
☀️ It's Almost All Sun
The Sun makes up more than 99% of all the mass in the whole solar system — all 8 planets combined are just a tiny fraction of it.
🪨 Two Kinds of Planets
Mercury, Venus, Earth, and Mars are small and rocky. Jupiter, Saturn, Uranus, and Neptune are huge balls of gas with no solid surface to stand on.
🌗 Gravity Depends on Size (and Density)
Bigger planets usually pull harder, but not always — Saturn is huge but so "fluffy" that its gravity is only a bit stronger than Earth's.