Uncovering the Secrets of Jupiter

Jupiter is the largest planet by volume and by mass in the solar system. While there are other planets in the galaxy that are even bigger, nothing short of the Sun commands the same presence in our neck of the woods. In addition to its raw size, there are many interesting facts about Jupiter, and a few surprises. So read on below for all the best facts about the "king of the planets".

Edited and updated by Carolyn Collins Petersen.

1
Jupiter's Famous Red Spot is a Storm that is Larger than the Entire Earth.

DIGITAL ILLUSTRATION OF JUPITER IN SPACE
Antonio M. Rosario/ Stockbyte/ Getty Images

The giant red spot on Jupiter is one of the planet's most famous features. It is known to have existed for at least 300 years and possibly longer. It's still quite powerful, and hasn't shown any signs of dying down. And while it appears small compared to the immense size of its host planet, the storm is big enough to hold three Earths from border to border.

2
Jupiter Has Rings.

This one usually surprises people. When we think of planetary rings, we typically think of Saturn. But all of the Jovian planets (literally: planets that are like Jupiter) have ring systems. Though, like Jupiter, they are usually very difficult to see. Specifically, it is unlikely that you would be able to spot them, even with a fairly powerful telescope. 

3
Jupiter Has the Strongest Gravity of all the Planets in the Solar System.

The Sun has an even stronger gravitational pull, but among the planets Jupiter is once again king. With an average surface gravity in excess of 3 times the Earth's pull, Jupiter sure sucks quite hard. This is made possible from the nearly 318 Earth masses crammed into its volume.

4
Jupiter is the Fastest Rotating Planet in our Solar System.

A day on Earth lasts about 24 hours. On Jupiter, however, a day passes in less than 10 (9 hours and 55 minutes). This rapid spinning is even more impressive given the planet's size.

5
Jupiter Actually produces its Own Radiation.

We see all of the planets in our solar system because our Sun emits great amounts of light (radiation) that is then reflected by the other heavenly bodies. For the most part, the Sun is the only body that produces its own energy (radiation). Notice I said for the most part. That is because Jupiter (and Saturn through a somewhat similar process) actually produces energy. The theory goes that Jupiter is actually shrinking and by doing so releases gravitational energy. While this release of energy isn't enough to make the planet light up like the Sun, it's still an impressive amount of energy for a planet.

6
Jupiter Has More than 60 Moons.

I say more than 60 because it's not completely clear exactly how many the gas giant has. As we take more and more detailed measurements we confirm the existence of more and more of these tiny orbiting rocks. Many of them may be captured asteroids from the asteroid belt. Others, like those closest to Jupiter, may have formed in orbit during the early solar system. Chances are at least 70 objects will eventually be classified as moons of Jupiter.

7
Jupiter's Moon Ganymede is the Largest Moon in the Solar System.

We typically think of our own Moon as being pretty big, but the title of the biggest in the solar system goes to Ganymede.

8
Jupiter is Visible to the Naked Eye

Not only can you see Jupiter with the naked eye on a clear night, but the giant planet will appear as one of the brightest objects in the sky.

9
Jupiter's Magnetic Field is 14 Times Stronger than Earth's

Because of this powerful magnetic field, brilliant auroras, like those seen near Earth's poles are visible with the right type of equipment.

10
Hubble Watched as a Comet Slammed into Jupiter

This was a historic event. Never before witnessed, a team of scientists were able to watch as fragments of the comet Shoemaker-Levy 9 crashed through the atmosphere of Jupiter. The result was the appearance of a dark spot where the impact occurred.

11
BONUS: Jupiter Will Never Become a Star

It has often been stated that Jupiter could be classified as a failed star. While there is an ounce of truth to this, Jupiter is quite far from becoming a star. A star is said to be born when the core of the object becomes so dense and hot that nuclear fusion is ignited. This process powers the star and makes it "shine". While Jupiter has all the basic ingredients, it doesn't have nearly enough mass to create the necessary core conditions. In fact, Jupiter would have to have at least 70 times more mass to achieve nuclear fusion in its core.