This image of Ganymede to be obtained passant par the JunoCam imager throughout Juno’s célibataire 7, 2021, flyby of the ... <+> icy moon.


NASA’s Juno spacecraft at Jupiter this la semaine got à within 645 miles/1,000 kilometers de Ganymede, auto Solar System’s largest moon.

Vous lisez ce: Le plus gros satellite de jupiter

The spacecraft’s JunoCam imaging système had seul 25 protocole to take photographs, just long enough parce que le five exposures, avant it then got fermé to Jupiter parce que le the 33rd time.

Bigger 보다 Mercury et only slightly smaller than Mars, image are now coming back from Juno de Ganymede’s pock-marked, gorgeously grooved et patterned surface.

This la peinture of the dark side du Ganymede was obtained par Juno’s Stellar referral Unit terre ... <+> caméra during its june 7, 2021, flyby du the moon.


The Juno science team will currently scour thé images, to compare them à those from previous missions, looking parce que le changes in surface features the might have occurred in auto 20 years because Ganymede to be last photographed.

“Things usually take place pretty rapid in the world de flybys ... Every seconde counts,” claimed Juno commander Manager Matt Johnson de JPL. Conditions météorologiques Monday, Juno raced previous Ganymede at 12 miles/19 kilometers revenir second et on Tuesday ce skimmed thé cloud tops of Jupiter at 36 miles/58 kilometers tout de suite second.

Larger 보다 both Mercury et Pluto and only a third smaller 보다 Mars, Ganymede has a diameter ns 3,273 miles/5,268 kilometers. It’s the largest moon and the ninth-largest thing in auto Solar System.

The biggest of Jupiter’s 79 moons, Ganymede is one ns the four Galilean satellites, the différent being Europa, Callisto et Io.These icy Jovian moons were first discovered passant par Italian astronomer Galileo Galilei in 1610.

Could Ganymede appui life? it does have a slim oxygen atmosphere, but it’s no breathable. However, single-cell microbial first could exist in the subterranean ocean.

About 10 fois deeper than Earth’s oceans and thought to contain more water 보다 is found nous Earth, Ganymede’s s is reckoned venir be 60 miles/100 kilometers thick and buried under an icy crust around 95 miles/150 kilometers thick.

“Ganymede’s crème glacée shell has some light and dark regions, saying that part areas pouvez be pure crème glacée while différent areas save on computer dirty ice,” stated Juno surtout Investigator scott Bolton de the Southwest Research institute in la conscience Antonio. “MWR will administer the tons in-depth détection of comment the composition and structure ns the ice varies with depth, leading to a meilleur understanding of comment the crème glacée shell forms et the recurring processes the resurface the calcul over time.”

Ganymede is likewise the seul moon in thé Solar system with a magnetic field—a bubble-shaped region du charged particles. Scientists have spotted aurorae—as ribbons of glowing, hot electrified gas—around the poles.

It’s the déménageur of the aurorae—which rock back and forth oui Ganymede’s magnetic ar interacts with surrounding Jupiter’s—that enabled scientists to determine the a large amount ns saltwater exist beneath Ganymede’s crust.

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à present the meilleur information in a simple view du Jupiter"s moon Ganymede, a global la peinture mosaic ... <+> was assembled, combine the le meilleur available imagery from NASA"s conduisant 1 and 2 spacecraft et NASA"s Galileo spacecraft. This image shows Ganymede centered at 200 west longitude. This mosaic (right) served oui the base map parce que le the geologic map of Ganymede (left).

USGS Astrogeology scientifique Center/Wheaton/NASA/JPL-Caltech

“As Juno surmonter behind Ganymede, radiophonique signals will passage through Ganymede’s ionosphere, causing petit changes in the frequency that need to be picked up by two antennas at auto Deep an are Network’s Canberra facility in Australia,” stated Dustin Buccino, a suggestions analysis engineer for the Juno commander at JPL. “If conditions météorologiques can measure this change, nous might it is in able à understand the connection between Ganymede’s ionosphere, that intrinsic magnetic field, and Jupiter’s magnetosphere.”

the shallow, scalloped depression in the center of this picture from NASA"s Galileo spacecraft is a ... <+> caldera-like function 5 to 20 kilometers wide nous Jupiter"s largest moon, Ganymede. Galileo. (Photo by: universel History Archive/Universal Images group via Getty Images)

universel Images coporation, groupe via Getty images

Previously photographed par NASA’s pionnier 10, Voyager, Galileo and the happen New horizons spacecraft, Juno’s images reveal a two types of action on Ganymede—highly cratered, darker regions and lighter travail that’s grooved and patterned.

Along with auto Ultraviolet Spectrograph (UVS) and Jovian Infrared Auroral Mapper (JIRAM) instruments, Juno’s Microwave Radiometer’s (MWR) peered into Ganymede’s water-ice crust,obtaining data on the composition et temperature.

auto north pole du Ganymede deserve to be watched in centre of this annotated image taken by the JIRAM infrared ... <+> imager aboard NASA"s Juno spacecraft nous Dec. 26, 2019. Auto thick heat is 0-degrees longitude.


Juno currently had a quick look at Ganymede, returning the first-ever images of itsnorth pole after a flyby nous December 26, 2019. However, this week’s flyby is by far its closest examination of the large moon.

Having just completed its main point five-year commander surveying thé giant planet, Juno’s 34 perijove—close flyby—of Jupiter sees cette in a new, much shorter orbit du the gigantic planet. Its nouveau trajectory has actually been carefully planned à make sure that Juno gets fermer la porte to two différent moons de Jupiter throughout its continuing to be 42 orbits with 2025.

thé Galilean satellite are thé four largest moons du Jupiter—Io, Europa, Ganymede, et Callisto.


The furthest solar-powered spacecraft from Earth, Juno will get to within 200 miles/320 kilometers de Europa nous September 29, 2022 et then flyby auto volcanic moon du Io twice, getting to within 900 miles/1,500 km of it on both December 30, 2023 et on February 3, 2024.

It’s possible that there will certainly be a further commander extension after that si the spacecraft et its battery remain healthy, despite ultimately cette will perform a “death dive” right into Jupiter venir prevent it accidentally crashing into—and polluting—one de Jupiter’s moons., tous of i m sorry are on NASA’s to-do perform in its search for traces ns life.

“Juno dead a suite du sensitive instruments peut être of seeing Ganymede in methods never avant possible,” stated Bolton. “By flying haricot de soja close, conditions météorologiques will bring the sonde of Ganymede into auto 21st century, both complementing future missions with our originalité sensors et helping prepare pour the prochain generation of missions to auto Jovian system—NASA’s Europa Clipperand thé European space Agency’s JUpiter ICy moons Explorer(JUICE) mission.”

Part of NASA’s new Frontiers program of medium-sized planetary scientifique spacecraft, Juno’s extended commander means the now relocating from a ordre focused nous studying thé giant planet’s gravity et magnetic fields à a complete system-explorer.

Wishing tu clear skies and wide eyes.

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I"m an experienced science, technology et travel journalist and stargazer writing about exploring the night sky, solar et lunar eclipses, moon-gazing,astro-travel, astronomy and space exploration. I"m auto editor de WhenIsTheNextEclipse.com et the author du "A Stargazing Program parce que le Beginners: A Pocket field Guide" (Springer, 2015), oui well as many eclipse-chasing guides.