Compare the Planets
See all eight planets in one place and spot the patterns — the rocky inner worlds, the giant outer worlds, and everything in between.
Leela spreads her planet cards across the floor. "Look, Manjari — Mercury is tiny, Jupiter is enormous, Earth is the only blue one. Can we see them all together?"
Manjari nods. "One table, eight worlds. Feast your eyes!"
The Eight Planets at a Glance
| Planet | Type | Order from Sun | Diameter | Year length | Known moons | One interesting fact |
|---|---|---|---|---|---|---|
| Mercury | Rocky planet | 1st | 4,879 km | 88 days | 0 | Fastest year of all |
| Venus | Rocky planet | 2nd | 12,104 km | 225 days | 0 | Hottest planet — runaway greenhouse |
| Earth | Rocky planet | 3rd | 12,742 km | 365.25 days | 1 | The only world we know with life |
| Mars | Rocky planet | 4th | 6,779 km | 687 days | 2 | Red from rust; had ancient rivers |
| Jupiter | Gas giant | 5th | 139,820 km | 11.9 years | 95 | Largest planet; storm bigger than Earth |
| Saturn | Gas giant | 6th | 116,460 km | 29.4 years | 146 | Famous rings of ice and rock |
| Uranus | Ice giant | 7th | 50,724 km | 84 years | 28 | Rolls around the Sun on its side |
| Neptune | Ice giant | 8th | 49,244 km | 165 years | 16 | Fastest winds; found by mathematics |
Look down the "Type" column: the four rocky planets are close to the Sun, and the four giants (gas and ice) are far from it. The Solar System has a clear structure!
Explore Each Planet
Prefer hands-on exploring? Flip through the planets one at a time — tap any world to open its profile.
Third planet from the Sun
Earth
Rocky Planet
- Diameter
- 12,742 km
- Year length
- 365.25 Earth days
- Day length
- 24 hours
- Moons
- 1
- Temperature
- About 15 °C on average
Notable: The only world we know that supports life
About 71% of Earth’s surface is covered in liquid water — the blue we see from space.
The Rocky Inner Worlds
Mercury, Venus, Earth, and Mars are the inner planets — smaller, rocky, and closer to the Sun. They have solid surfaces you could stand on (with a good spacesuit). Venus is the odd one out: similar in size to Earth, but with a crushing, scorching atmosphere.
Smallest planet — barely bigger than our Moon
Earth's twin in size, but the hottest planet
The blue world — full of liquid water and life
The red desert with giant volcanoes
The Giant Outer Worlds
Jupiter and Saturn are gas giants — enormous balls of hydrogen and helium with no solid surface. Uranus and Neptune are ice giants — smaller, colder, and rich in water, methane, and ammonia ices.
The giants are so large that the four rocky planets could fit inside Jupiter alone, with room to spare. Size is the great divide of the Solar System!
Compare Your Own Weight
The same mass feels different on different worlds, because gravity differs. On Mercury, you would weigh about 38% of your Earth weight. On Jupiter — if you could stand on it — you would weigh about 2.5 times more. On the Moon, only about one-sixth!
If you could visit any planet for one day, which would you choose — and what would you want to see first?