5. JUPITER Jupiter was on its way to becoming a star, but it failed to get big enough to turn on. It’s still pretty big though and quite beautiful. It’s the fifth planet from the Sun and the first of the gas giants. This is the famous Great Red Spot – a storm that’s been brewing for hundreds of years. It’s big enough to cover three Earths. Io is one of Jupiter’s sixty-seven moons. It’s the most volcanic body we know about. This is Io circling around Jupiter. This is what Jupiter might look like from Europa. Europa is another one of Jupiter’s moons. It was discovered in 1610 by Galileo Galilei.