Tanno and Iguda in their spaceship, the Widget

As Jupiter is another gas giant, Tanno and Iguda could only visit some of its moons. In particular, they went to Io and Europa.

Volcanic Io and Europa together
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/ Southwest Research Institute

Io is a rocky, volcanic moon, you can see its Tvashtar volcano exploding near the top of it.
Europa is an ice world with a liquid sea under the ice. In this picture we just see it as a crescent, about 4 million kilometres away.

Jupiter factfile 
Position from the sun5th planet
Diameter 143,000 km
Distance from sun780,000,000 km
Day length 10 hours
Year length 11.9 years
Number of moons53 (plus 26 possibles)
Surface temperature462 °C
Gravity24.8 m/s2
AtmosphereHydrogen, helium
FUN FACT: Jupiter’s gravity is the strongest of any planet in the solar system.

Jupiter in 3D, use your mouse to turn the planet and make it bigger and smaller.

Source: NASA Visualization Technology Applications and Development (VTAD)
Mosaic of Jupiter's moon Io

This is a ‘mosaic’ image of Jupiter’s moon Io. That means it’s many photos all put together to make the overall picture. The photos were taken by the Voyager 1 space probe, and the surface is thought to be covered in sulfur and sulfur dioxide.

Can you find two great volcanoes: Pele and Loki ?

Image Credit: NASA/JPL

Europa, a moon of Jupiter

Here’s an awesome view of Jupiter’s moon Europa, taken by NASA’s Galileo spacecraft, which has been orbiting Jupiter since 1995.

Image Credit: NASA/JPL/University of Arizona


Astrobiologists work out ways to find life on other planets, if there is any! Tanno and Iguda have been following the Pontus which is an unmanned robot craft, searching the solar system for life.

The Pontus

Imagine you are an astrobiologist on the mission control team for the Pontus. Write a research plan, explaining why Europa is a good place to search for life, and include notes on what the Pontus should check for. You could include some ideas for experiments to do there. Watch the video below for help and information.

You can go to the previous secret pages by clicking the planets below.

The MoonVenusMercury
Moon landing sites for Apollo missions
The SunMarsAsteroids
An image of the Sun in 2018 when it had no sunspots.