Planet Jupiter Facts
- Jupiter is the fifth planet from the sun. Its average distance from the sun is around 484 million miles (779 million km), more than five times Earth's distance.
- The gas giant is the largest planet in the solar system with a diameter of around 89,000 miles (143,000 km).
- Jupiter is 11 times larger than Earth in diameter and around 10% as large as the sun.
- Over 1,000 Earth's could fit inside the volume of Jupiter.
- Jupiter is virtually all atmosphere but may possibly have a small solid core.
- The great red spot (pictured right) is a massive storm which has raged for centuries.
- In 1973 Pioneer 10 became the first spacecraft to visit the planet.
- In July 1994 NASA's Galileo spacecraft captured remarkable images of the comet Shoemaker-Levy 9 smashing into Jupiter's upper atmosphere.
- Jupiter is one of the brightest objects in the night sky and can be easily viewed with the naked eye.
Orbit, Atmosphere & Temperature
Jupiter's OrbitJupiter travels once around the Sun every 12 years and spins on its own axis every 10 hours compared to 24 on Earth, making it the fastest rotating planet in the Solar System.
Jupiter's AtmosphereThe atmosphere of Jupiter is composed of around 90 percent hydrogen and 10 percent helium, there are also very small trace amounts of other elements and gases such as oxygen, carbon, neon, methane and water vapor.
Jupiter's TemperatureThe temperature in Jupiter's upper atmosphere is around
-145C (-230F). Deeper below the clouds the temperate reaches 21C (70F). Near the planet's center the temperature is hotter than the surface of the Sun!
Jupiter with Moon IoImage taken by NASA's Voyager 1 spacecraft on its approach to Jupiter in 1979
Jupiter's red spotYou could fit three Earths inside Jupiter's famous atmospheric feature known as the giant red spot
The volcanic moon Io orbiting Jupiter
Moons & Origin of NameJupiter has 62 moons, 16 of which have a diameter of at least 6 miles. The four main moons of Jupiter are Io, Europa, Ganymede and Callisto, all discovered in 1610 by Galileo and referred to as the "Galilean Moons" (see below).
Jupiter was named by the Romans after their King of Gods.
Life on JupiterAmazing as it may seem some scientists have speculated that life on Jupiter is possible. This would occur beneath the cloud cover where room temperature conditions exist, these lifeforms would be airborne although this theory is thought to be highly speculative.
Jupiter Moon Io
Jupiter Moon Europa
Jupiter Moon Ganymede
Jupiter Moon Callisto
Aurora at Jupiter's Pole
Voyager 1 approaching Jupiter
Jupiter with its moon Io in foreground
Europa Jupiter System MissionLaunch: 2020
A joint venture by NASA and the ESA (Europe) will study the Jovain System using two separate spacecraft. They will map Jupiter's atmosphere and magnetic field as well as studying its interactions with the Galilean Moons.
JunoLaunch: August 2011
Arrival: August 2016
Will survey Jupiter from polar orbit, studying the planet's interior. Will determine the amount of global water and ammonia present in the atmosphere and whether Jupiter has an ice rock core.
New HorizonsLaunch: January 2006
Arrival: January 2007
Observed Jupiter over 5 months in early 2007 on its way to Pluto.
Cassini-HuygensLaunch: October 1997
Arrival: December 2000
Agency: NASA/ESA (Europe)
Captured images of Jupiter and its moons on a flyby on its way to Saturn.
UlyssesLaunch: October 1990
Arrival: February 1992
Studied Jupiter's strong magnetic field and radiation levels on its way to the Sun.
GalileoLaunch: October 1989
Arrival: December 1995
Galileo was the first spacecraft to deploy a probe into an outer planet’s atmosphere. When the probe plunged into Jupiter's clouds it sent back information about temperature, wind speeds and pressure before finally succumbing to the intense pressure. Galileo also studied Jupiter's moons and made many discoveries before being deliberately destroyed by sending it on a collision course with the gas giant, this was done in order to avoid any possibility of the spacecraft contaminating Europa’s salty ocean.
Voyager 2Launch: August 1977
Arrival: April 1979
As part of its "Grand Tour" of the solar system Voyager 2 took 18,000 images of the planet during its flyby and discovered 3 new moons.
Voyager 1Launch: September 1977
Arrival: August 1979
Took more than 18,000 images of the planet and its moons during its fly by.
Pioneer 11Launch: April 1973
Arrival: December 1974
The second spacecraft to explore the outer solar system, it flew within 34,000 km (21,000 miles) of Jupiter's clouds. Pioneer 11 studied the planet's magnetic field, atmosphere and took pictures of Jupiter and its moons. Instruments were shut down on Pioneer 11 in September 1995.
Pioneer 10Launch: March 1972
Arrival: December 1973
The first spacecraft to explore the outer solar system, it flew within 200,000 km (124,000 miles) of Jupiter's cloud tops. Pioneer 10 detected the tremendous radiation levels as it passed the gas giant. Contact was lost in April 2001 as the spacecraft headed out of the solar system in the general direction of a red star called Aldebaran.
Planet Jupiter Statistics
Comparison with Earth