From Wikipedia, the free encyclopedia
Jump to navigation Jump to search


An image of Jupiter taken by the Hubble Space Telescope
Full-disc view of Jupiter in natural color in April 2014

Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. Jupiter and Saturn are gas giants; the other two giant planets, Uranus and Neptune, are ice giants. Jupiter has been known to astronomers since antiquity. The Romans named it after their god Jupiter. When viewed from Earth, Jupiter can reach an apparent magnitude of −2.94, bright enough for its reflected light to cast shadows, and making it on average the third-brightest natural object in the night sky after the Moon and Venus.

Jupiter is primarily composed of hydrogen with a quarter of its mass being helium, though helium comprises only about a tenth of the number of molecules. It may also have a rocky core of heavier elements, but like the other giant planets, Jupiter lacks a well-defined solid surface. Because of its rapid rotation, the planet's shape is that of an oblate spheroid (it has a slight but noticeable bulge around the equator). The outer atmosphere is visibly segregated into several bands at different latitudes, resulting in turbulence and storms along their interacting boundaries. A prominent result is the Great Red Spot, a giant storm that is known to have existed since at least the 17th century when it was first seen by telescope. Surrounding Jupiter is a faint planetary ring system and a powerful magnetosphere. Jupiter has 79 known moons, including the four large Galilean moons discovered by Galileo Galilei in 1610. Ganymede, the largest of these, has a diameter greater than that of the planet Mercury.

Selected general articles

Need help?

Do you have a question about Jupiter that you can't find the answer to?

Consider asking it at the Wikipedia reference desk.

Selected images


Get involved

For editor resources and to collaborate with other editors on improving Wikipedia's Jupiter-related articles, see WikiProject Jupiter.


Associated Wikimedia

The following Wikimedia Foundation sister projects provide more on this subject:






Learning resources



Purge server cache

Retrieved from "https://en.wikipedia.org/w/index.php?title=Portal:Jupiter&oldid=860332764"
This content was retrieved from Wikipedia : http://en.wikipedia.org/wiki/Portal:Jupiter
This page is based on the copyrighted Wikipedia article "Portal:Jupiter"; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA