page_title: Jupiter
section_title: Structure
hierarchical_section_title: Jupiter / Structure
caption_attribution_description: Voyager 1 / Voyager 2 English: NASA photograph of one of the two identical Voyager space probes Voyager 1 and Voyager 2 launched in 1977. The 3.7 metre diameter high-gain antenna (HGA) is attached to the hollow ten-sided polygonal body housing the electronics, here seen in profile. The Voyager Golden Record is attached to one of the bus sides. The angled square panel below is the optical calibration target and excess heat radiator. The three radioisotope thermoelectric generators (RTGs) are mounted end-to-end on the left-extending boom. One of the two planetary radio and plasma wave antenna extends diagonally left and down, the other extends to the rear, mostly hidden here. The compact structure between the RTGs and the HGA are the high-field and low-field magnetometers (MAG) in their stowed state; after launch an Astromast boom extended to 13 metres to distance the low-field magnetometers. The instrument boom extending to the right holds, from left to right: the cosmic ray subsystem (CRS) above and Low-Energy Charged Particle (LECP) detector below; the Plasma Spectrometer (PLS) above; and the scan platform that rotates about a vertical axis. The scan platform comprises: the Infrared Interferometer Spectrometer (IRIS) (largest camera at right); the Ultraviolet Spectrometer (UVS) to the right of the UVS; the two Imaging Science Subsystem (ISS) vidicon cameras to the left of the UVS; and the Photopolarimeter System (PPS) barely visible under the ISS. Suggested for English Wikipedia:alternative text for images: A space probe with squat cylindrical body topped by a large parabolic radio antenna dish pointing upwards, a three-element radioisotope thermoelectric generator on a boom extending left, and scientific instruments on a boom extending right. A golden disk is fixed to the body.
context_page_description: Jupiter is the largest planet in the Solar System. It is the fifth planet from the Sun. Jupiter is a gas giant, both because it is so large and made up of gas. The other gas giants are Saturn, Uranus, and Neptune.
  Jupiter has a mass of 1.8986×10²⁷ kg, or about 318 Earths. This is twice the mass of all the other planets in the Solar System put together.
  Jupiter can be seen even without the use of telescope. It was known to the ancient Romans, who named it after their god Jupiter. Jupiter is the third brightest object in the night sky. Only the Earth's moon and Venus are brighter.
  Jupiter has at least 79 moons. Of these, around 50 are very small and less than five kilometres wide. The four largest moons of Jupiter are Io, Europa, Ganymede, and Callisto. They are called the Galilean moons, because Galileo Galilei discovered them. Ganymede is the largest moon in the Solar System. It is larger in diameter than Mercury. In 2018 another ten very small moons were discovered
context_section_description: Jupiter is the biggest planet in the Solar System with a diameter of 142,984 km. This is eleven times bigger than the diameter of Earth.
caption: A picture by an artist of the Voyager 1 spacecraft that flew past Jupiter in 1979.
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