25 Super Cool Facts About Jupiter

Posted by , Updated on September 27, 2017

Are you a space lover? Even if you’re not, there are some things out there in the universe that are sure to capture your interest. One of those things is Jupiter. Did you know that Jupiter almost became a star like our sun? That’s right, we would have had two stars in our Solar System. These are 25 Super Cool Facts About Jupiter!


Jupiter is the fourth brightest object in the Solar System when viewed from Earth. (The Sun, Moon, and Venus are brighter.)

night skySource: nasa.gov

The ancient Babylonians were the first to record Jupiter around the 8th century BC. That's almost 3,000 years ago!

babylonSource: nasa.gov

Although Jupiter is named after the King of the Roman gods, the Greeks knew it as Zeus, the god of thunder. Germanic tribes saw the planet as Thor.

lightningSource: nasa.gov

Jupiter revolves on its axis every 9 hours and 55 minutes. This gives it the shortest day out of all the planets!

jupiterSource: nasa.gov

Jupiter has a slightly flattened shape due to its extremely rapid spin.

jupiterSource: nasa.gov


However, from the perspective of Earth, Jupiter moves very slowly in the sky. This is because it takes over 11 Earth years to orbit the sun!

planetsSource: nasa.gov

The Great Red Spot is actually a storm in Jupiter's atmosphere. It has been raging for over 300 years and is so big that 3 Earth's could fit inside it!

jupiterSource: nasa.gov

Jupiter's upper atmosphere is mostly clouds made of sulfur and ammonia. If you could smell it, it would stink!

sulphurSource: nasa.gov

Beneath the upper clouds, the rest of the atmosphere is primarily hydrogen and helium.

heliumSource: nasa.gov

So what about the core? Well, Jupiter's gaseous atmosphere gradually transitions from gas into liquid. The planet may have a rocky core, but it likely lacks a solid surface.

jupiter coreSource: nasa.gov

Jupiter is actually known as a "failed star." This is because it contains the same mix of hydrogen and helium as other stars like the sun, but it never got big enough to start nuclear fusion.

jupiterSource: nasa.gov

In the Sun, hydrogen is essentially "crushed" until it becomes helium. This process (nuclear fusion) requires lots of internal pressure, which comes from being massive. So, if Jupiter had gotten just a little bigger, we would have had a 2-star Solar System!

sunSource: nasa.gov

There is water deep inside of Jupiter, although its concentration is very low.

waterSource: nasa.gov

One of Jupiter's moons, Ganymede, is the largest moon in the Solar System. In fact, it's bigger than Mercury!

ganymedeSource: nasa.gov

Jupiter has 69 moons in total! That is more than any other planet in the Solar System. Only Saturn comes close with 62 moons. In fact, new moons are still being discovered!

moonsSource: nasa.gov

The four largest moons are called Galilean moons. We've already met one - Ganymede. The other three are Lo, Europa, and Callisto. If they were circling the Sun, they would be considered Dwarf Planets.

galilean moonsSource: nasa.gov

On the topic of size, Jupiter is two times more massive than all the other planets combined!

jupiterSource: nasa.gov

Although they are harder to see than Saturn's or Uranus's, the rings of Jupiter extend from about 100,000 km above its atmosphere to almost 250,000 km above its atmosphere. They can be as thick as 12,000 km!

ringsSource: nasa.gov

Jupiter is a very windy place. Average wind speed in the atmosphere can be anywhere from 192 mph to 400 mph.

windSource: nasa.gov

Although the temperature in Jupiter's clouds is about -145 C, the temperature in its core is almost 24,000 C. That is hotter than the surface of the Sun!

thermometerSource: nasa.gov

If you were somehow standing at the very top of Jupiter's clouds, you would feel the force of gravity about 2.4 times stronger than on Earth's surface. So if you weighed 100 pounds here, you would weigh 240 pounds there!

scaleSource: nasa.gov

Jupiter has the strongest magnetic field in the Solar System due to the huge ocean of liquid hydrogen deep beneath its clouds.

magnetsSource: nasa.gov

Jupiter's moon Europa is almost entirely liquid water beneath its icy surface. In fact, it has twice as much water as Earth!

europaSource: nasa.gov

More than 1,300 Earths would fit inside of Jupiter!

jupiterSource: nasa.gov

From 1979 to 2007, eight NASA spacecrafts studied Jupiter. As of this writing, a new spacecraft named Juno is studying Jupiter to help scientists understand how it was formed.

jupiterSource: nasa.gov

Featured Image: pixabay (public domain), 25. Mike Lewinski from Embudo, NM, United States, Jupiter and the Pleiades – 20 Sept. 2012CC BY 2.0, 24-22. pixabay (public domain), 21. NASA/JPL/Space Science Institute, 20-17. pixabay (public domain), 16. KelvinsongJupiter diagramCC BY-SA 3.0, 15-1. pixabay (public domain),

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