On this day, January 7th, in 1610 Galileo Galilei, an Italian astronomer, physicist and engineer, discovered three of Jupiter’s moons; Io, Europa and Ganymede.
Here are some facts about Jupiter and it’s moons:
- Ganymede is the largest of Jupiter’s moons. It’s larger than the planet Mercury.
- Calypso is the 2nd largest of Jupiter’s moons. It’s almost as large as the planet Mercury.
- Jupiter is the 4th brightest object in the sky.
- Jupiter is one of the 5 planets visible to the naked eye from Earth.
- Jupiter has the shortest days of all the planets in our solar system.
- Jupiter’s ring is composed mainly of dust particles.
- The famous red spot on Jupiter is a huge storm. It’s been raging for more than 350 years.