Jupiter's Moon

How many confirmed moons does Jupiter have?

• 27
• 67
• 270
• 670

In what year did Galileo discover moons orbiting Jupiter?

• 1610
• 1640
• 1670
• 1710

How many of Jupiter's moons are referred to as "Galilean moons"?

• two
• three
• four
• five

The biggest of Jupiter's moons is _____

• Io
• Europa
• Ganymede
• Callisto

Ganymede, the largest moon in our solar system, is even bigger than the planet _____

• Mercury
• Venus
• Mars
• Earth

Ganymede is mostly rock and ice, but it probably has a liquid _____ core

• iron
• hydrogen
• helium
• nickel

Ganymede is crisscrossed with large _____

• grooves
• mountain ranges
• craters
• canals

The second biggest of Jupiter's moons is _____

• Io
• Europa
• Ganymede
• Callisto

The surface of Callisto is mostly _____

• ice
• dust
• iron oxide
• volcanoes

How does Io, Jupiter's third biggest moon, compare in size to our own moon?

• Io is much smaller
• Io is slightly smaller
• Io is slightly bigger
• Io is much bigger