Jupiter's moons

The Galilean satellites, in other words, Jupiter's moons, 95 moons that have been official by IAU. They were the first moons discovered(excluding our moon) and named after an old Italian fellow Galileo Galilei(who had an unfortunate death). 

Today we will be speaking about the four largest moons of Jupiter (in order):

• Ganymede is the largest moon in our solar system. Ganymede has a width of 5300 km making it bigger than Mercury or Pluto! Ganymede has many craters on its surface and presumably underground seawater! It's also the moon known for its own magnetic field in the solar system.

• Callisto is the moon with the most cratered surface, that makes it look like a galaxy! (in the image below). Callisto is a very old moon, predicted to be 4 billion years old. Just like Ganymede, Callisto has a salty ocean under, however, the water Callisto has could contain more than all Earth's oceans combined.

• Io is named "Io" the wanderer and Greek iōn for going. Jupiter’s gravity pulls onto Io, making enough heat to power volcanoes on its surface! This makes Io the most volcano-active in the solar system. Because it's quite powerful it can even be seen with large telescopes.

• Last but not least, Europa, the planet that could possibly hold life and a popular destination for many spacecraft like NASA’s Europa Clipper, and printed on my mug. However, Europa has a thin oxygen atmosphere making it hard to breathe for humans. Similar to the other moons, it has a saltwater ocean beneath the icy surface.

Link to a cool simulation of Jupiter with its moon: Jupiter Moons