Jupiter is the king. It holds more than twice the mass of every other planet put together, and about 1,300 Earths would fit inside it.
It is also the fastest spinner. A day on Jupiter lasts under 10 hours, which flattens it so much you can see the bulge at its middle.
The Great Red Spot is a storm wider than Earth. People have been watching it through telescopes for well over 150 years.
And there is no ground. Jupiter is mostly hydrogen and helium that just get thicker and hotter the deeper you go.
In 1995 NASA dropped the Galileo probe into it. It fell about 150 km into the clouds, sending data for 58 minutes, before the heat and pressure silenced it.
Since 2016, NASA's Juno spacecraft has been circling Jupiter, built to see what lies under the clouds.
One thing it found: Jupiter's core isn't a neat solid ball. It is fuzzy, smeared out, and scientists are still arguing about why.
- Width
- 139,822 km
- One day
- 9.9 hours
- One year
- 11.9 Earth years
- Moons
- 115
- Temperature
- −110 °C at the cloud tops
- 70 kg on Earth weighs
- 177 kg here
