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It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, while being slightly less than one-thousandth the mass of the Sun. Jupiter is the third brightest natural object in the Earth's night sky after the Moon and Venus, and it has been observed since prehistoric times. It was named after Jupiter, the chief deity of ancient Roman religion. Jupiter is primarily composed of hydrogen, followed by helium which constitutes a quarter of its mass and a tenth of its volume. The ongoing contraction of Jupiter's interior generates more heat than the planet receives from the Sun. Because of its rapid rotation at a rate of 1 rotation per 10 hours, the planet's shape is an oblate spheroid, having a slight but noticeable bulge around the equator. The outer atmosphere is divided into a series of latitudinal bands, with turbulence and storms along their interacting boundaries. A prominent result of this is the Great Red Spot, a giant storm which has been observed since at least 1831. Jupiter is surrounded by a faint planetary ring system and has a powerful magnetosphere. The planet's magnetic tail is nearly 800 million kilometres (5.3 astronomical units; 500 million miles) long. Jupiter has 92 known moons and likely many more, including the four large moons discovered by Galileo Galilei in 1610: Io, Europa, Ganymede, and Callisto. Ganymede is the largest out of the four, being larger than the planet Mercury, followed by Callisto with Io and Europa being approximately the size of Earth's moon. Pioneer 10 was the first spacecraft to visit Jupiter, making its closest approach to the planet in December 1973. Jupiter has since been explored by multiple robotic spacecraft, beginning with the Pioneer and Voyager flyby missions from 1973 to 1979, and later with the Galileo orbiter in 1995. In 2007, New Horizons visited Jupiter for a gravity assist to increase its speed, bending its trajectory on the way to Pluto. The latest probe to visit Jupiter, Juno, entered its orbit in July 2016. Future targets for exploration in the Jupiter system include its moon Europa, which likely has an ice-covered liquid ocean which scientists think could sustain life. Name and symbol In both the ancient Greek and Roman civilizations, Jupiter was named after the chief god of the divine pantheon: Zeus for the Greeks and Jupiter for the Romans. The International Astronomical Union formally adopted the name Jupiter for the planet in 1976, and has since named newly discovered satellites for the god's lovers, favourites, and descendants.[16] The planetary symbol for Jupiter, ♃, descends from a Greek zeta with a horizontal stroke, ⟨Ƶ⟩, as an abbreviation for Zeus.[17][18] In Germanic mythology, Jupiter is equated to Thor, the namesake of Thursday.[19] It has been theorized that this replaced the Latin name for the day, Dies Iovi ('Day of Jupiter').[20] The Latin name Iovis is associated with the etymology of Zeus ('sky father'). The English equivalent, Jove, is only known to have come into use as a poetic name for the planet around the 14th century.[21] The original Greek deity Zeus supplies the root zeno-, which is used to form some Jupiter-related words, such as zenographic.[c] Jovian is the adjectival form of Jupiter. The older adjectival form jovial, employed by astrologers in the Middle Ages, has come to mean 'happy' or 'merry', moods ascribed to Jupiter's influence in astrology.[22] Formation and migration Main article: Grand tack hypothesis See also: Formation and evolution of the Solar System Jupiter is believed to be the oldest planet in the Solar System.[23] Current models of Solar System formation suggest that Jupiter formed at or beyond the snow line: a distance from the early Sun where the temperature is sufficiently cold for volatiles such as water to condense into solids.[24] The planet began as a solid core, which then accumulated its gaseous atmosphere. As a consequence, the planet must have formed before the solar nebula was fully dispersed.[25] During its formation, Jupiter's mass gradually increased until it had 20 times the mass of the Earth, approximately half of which was made up of silicates, ices and other heavy-element constituents. When the proto-Jupiter grew larger than 50 Earth masses it created a gap in the solar nebula. Thereafter, the growing planet reached its final masses in 3–4 million years.[23] According to the "grand tack hypothesis", Jupiter began to form at a distance of roughly 3.5 AU (520 million km; 330 million mi) from the Sun. As the young planet accreted mass, interaction with the gas disk orbiting the Sun and orbital resonances with Saturn caused it to migrate inward.[24][26] This upset the orbits of several super-Earths orbiting closer to the Sun, causing them to collide destructively. Saturn would later have begun to migrate inwards too, much faster than Jupiter, until the two planets became captured in a 3:2 mean motion resonance at approximately 1.5 AU (220 million km; 140 million mi) from the Sun. This changed the direction of migration, causing them to migrate away from the Sun and out of the inner system to their current locations.[27] All of this happened over a period of 3–6 million years, with the final migration of Jupiter occurring over several hundred thousand years.[26][28] Jupiter's departure from the inner solar system eventually allowed the inner planets—including Earth—to form from the rubble.[29] There are several problems with the grand tack hypothesis. The resulting formation timescales of terrestrial planets appear to be inconsistent with the measured elemental composition.[30] It is likely that Jupiter would have settled into an orbit much closer to the Sun if it had migrated through the solar nebula.[31] Some competing models of Solar System formation predict the formation of Jupiter with orbital properties that are close to those of the present day planet.[25] Other models predict Jupiter forming at distances much farther out, such as 18 AU (2.7 billion km; 1.7 billion mi).[32][33] Based on Jupiter's composition, researchers have made the case for an initial formation outside the molecular nitrogen (N2) snowline, which is estimated at 20–30 AU (3.0–4.5 billion km; 1.9–2.8 billion mi) from the Sun,[34][35] and possibly even outside the argon snowline, which may be as far as 40 AU (6.0 billion km; 3.7 billion mi). Having formed at one of these extreme distances, Jupiter would then have migrated inwards to its current location. This inward migration would have occurred over a roughly 700,000-year time period,[32][33] during an epoch approximately 2–3 million years after the planet began to form. In this model, Saturn, Uranus and Neptune would have formed even further out than Jupiter, and Saturn would also have migrated inwards. Physical characteristics Jupiter is a gas giant, being primarily composed of gas and liquid rather than solid matter. It is the largest planet in the Solar System, with a diameter of 142,984 km (88,846 mi) at its equator.[36] The average density of Jupiter, 1.326 g/cm3, is about the same as simple syrup (syrup USP),[37] and is lower than those of the four terrestrial planets.[38][39] Composition Jupiter's upper atmosphere is about 90% hydrogen and 10% helium by volume. Since helium atoms are more massive than hydrogen molecules, Jupiter's atmosphere is approximately 24% helium by mass.[40] The atmosphere also contains trace amounts of methane, water vapour, ammonia, and silicon-based compounds. There are also fractional amounts of carbon, ethane, hydrogen sulfide, neon, oxygen, phosphine, and sulfur. The outermost layer of the atmosphere contains crystals of frozen ammonia. Through infrared and ultraviolet measurements, trace amounts of benzene and other hydrocarbons have also been found.[41] The interior of Jupiter contains denser materials—by mass it is roughly 71% hydrogen, 24% helium, and 5% other elements.[42][43] The atmospheric proportions of hydrogen and helium are close to the theoretical composition of the primordial solar nebula. Neon in the upper atmosphere only consists of 20 parts per million by mass, which is about a tenth as abundant as in the Sun.[44] Helium is also reduced to about 80% of the Sun's helium composition. This depletion is a result of precipitation of these elements as helium-rich droplets, a process that happens deep in the interior of the planet.[45][46] Based on spectroscopy, Saturn is thought to be similar in composition to Jupiter, but the other giant planets Uranus and Neptune have relatively less hydrogen and helium and relatively more of the next most common elements, including oxygen, carbon, nitrogen, and sulfur.[47] Those planets are known as ice giants, because the majority of their volatile compounds are in solid form. Size and mass Main article: Jupiter mass see caption Jupiter with its moon Europa on the left. Earth's diameter is 11 times smaller than Jupiter, and 4 times larger than Europa. Jupiter's mass is 2.5 times that of all the other planets in the Solar System combined—so massive that its barycentre with the Sun lies above the Sun's surface at 1.068 solar radii from the Sun's centre.[48] Jupiter is much larger than Earth and considerably less dense: it has 1,321 times the volume of the Earth, but only 318 times the mass.[7][49]: 6  Jupiter's radius is about one tenth the radius of the Sun,[50] and its mass is one thousandth the mass of the Sun, as the densities of the two bodies are similar.[51] A "Jupiter mass" (MJ or MJup) is often used as a unit to describe masses of other objects, particularly extrasolar planets and brown dwarfs. For example, the extrasolar planet HD 209458 b has a mass of 0.69 MJ, while Kappa Andromedae b has a mass of 12.8 MJ.[52] Theoretical models indicate that if Jupiter had over 40% more mass, the interior would be so compressed that its volume would decrease despite the increasing amount of matter. For smaller changes in its mass, the radius would not change appreciably.[53] As a result, Jupiter is thought to have about as large a diameter as a planet of its composition and evolutionary history can achieve.[54] The process of further shrinkage with increasing mass would continue until appreciable stellar ignition was achieved.[55] Although Jupiter would need to be about 75 times more massive to fuse hydrogen and become a star,[56] its diameter is sufficient as the smallest red dwarf may be only slightly larger in radius than Saturn.[57] Jupiter radiates more heat than it receives through solar radiation, due to the Kelvin–Helmholtz mechanism within its contracting interior.[58]: 30 [59] This process causes Jupiter to shrink by about 1 mm (0.039 in)/yr.[60][61] At the time of its formation, Jupiter was hotter and was about twice its current diameter.[62] Internal structure Diagram of Jupiter, its interior, surface features, rings, and inner moons. Before the early 21st century, most scientists proposed one of two scenarios for the formation of Jupiter. If the planet accreted first as a solid body, it would consist of a dense core, a surrounding layer of liquid metallic hydrogen (with some helium) extending outward to about 80% of the radius of the planet,[63] and an outer atmosphere consisting primarily of molecular hydrogen.[61] Alternatively, if the planet collapsed directly from the gaseous protoplanetary disk, it was expected to completely lack a core, consisting instead of denser and denser fluid (predominantly molecular and metallic hydrogen) all the way to the centre. Data from the Juno mission showed that Jupiter has a diffuse core that mixes into its mantle.[64][65][66] This mixing process could have arisen during formation, while the planet accreted solids and gases from the surrounding nebula.[67] Alternatively, it could have been caused by an impact from a planet of about ten Earth masses a few million years after Jupiter's formation, which would have disrupted an originally solid Jovian core.[68][69] It is estimated that the core takes up 30–50% of the planet's radius, and contains heavy elements with a combined mass 7–25 times the Earth.[70] Outside the layer of metallic hydrogen lies a transparent interior atmosphere of hydrogen. At this depth, the pressure and temperature are above molecular hydrogen's critical pressure of 1.3 MPa and critical temperature of 33 K (−240.2 °C; −400.3 °F).[71] In this state, there are no distinct liquid and gas phases—hydrogen is said to be in a supercritical fluid state. The hydrogen and helium gas extending downward from the cloud layer gradually transitions to a liquid in deeper layers, possibly resembling something akin to an ocean of liquid hydrogen and other supercritical fluids.[58]: 22 [72][73][74] Physically, the gas gradually becomes hotter and denser as depth increases.[75][76] Rain-like droplets of helium and neon precipitate downward through the lower atmosphere, depleting the abundance of these elements in the upper atmosphere.[45][77] Calculations suggest that helium drops separate from metallic hydrogen at a radius of 60,000 km (37,000 mi) (11,000 km (6,800 mi) below the cloud tops) and merge again at 50,000 km (31,000 mi) (22,000 km (14,000 mi) beneath the clouds).[78] Rainfalls of diamonds have been suggested to occur, as well as on Saturn[79] and the ice giants Uranus and Neptune.[80] The temperature and pressure inside Jupiter increase steadily inward as the heat of planetary formation can only escape by convection.[46] At a surface depth where the atmospheric pressure level is 1 bar (0.10 MPa), the temperature is around 165 K (−108 °C; −163 °F). The region where supercritical hydrogen changes gradually from a molecular fluid to a metallic fluid spans pressure ranges of 50–400 GPa with temperatures of 5,000–8,400 K (4,730–8,130 °C; 8,540–14,660 °F), respectively. The temperature of Jupiter's diluted core is estimated to be 20,000 K (19,700 °C; 35,500 °F) with a pressure of around 4,000 GPa.[81] Atmosphere Main article: Atmosphere of Jupiter Timelapse of Jupiter's cloud system moving over the course of one month (photographed during Voyager 1 flyby in 1979) The atmosphere of Jupiter extends to a depth of 3,000 km (2,000 mi) below the cloud layers.[81] Cloud layers View of Jupiter's south pole Enhanced colour view of Jupiter's southern storms Jupiter is perpetually covered with clouds of ammonia crystals, which may contain ammonium hydrosulfide as well.[82] The clouds are located in the tropopause layer of the atmosphere, forming bands at different latitudes, known as tropical regions. These are subdivided into lighter-hued zones and darker belts. The interactions of these conflicting circulation patterns cause storms and turbulence. Wind speeds of 100 metres per second (360 km/h; 220 mph) are common in zonal jet streams.[83] The zones have been observed to vary in width, colour and intensity from year to year, but they have remained stable enough for scientists to name them.[49]: 6  The cloud layer is about 50 km (31 mi) deep, and consists of at least two decks of ammonia clouds: a thin clearer region on top with a thick lower deck. There may be a thin layer of water clouds underlying the ammonia clouds, as suggested by flashes of lightning detected in the atmosphere of Jupiter.[84] These electrical discharges can be up to a thousand times as powerful as lightning on Earth.[85] The water clouds are assumed to generate thunderstorms in the same way as terrestrial thunderstorms, driven by the heat rising from the interior.[86] The Juno mission revealed the presence of "shallow lightning" which originates from ammonia-water clouds relatively high in the atmosphere.[87] These discharges carry "mushballs" of water-ammonia slushes covered in ice, which fall deep into the atmosphere.[88] Upper-atmospheric lightning has been observed in Jupiter's upper atmosphere, bright flashes of light that last around 1.4 milliseconds. These are known as "elves" or "sprites" and appear blue or pink due to the hydrogen.[89][90] The orange and brown colours in the clouds of Jupiter are caused by upwelling compounds that change colour when they are exposed to ultraviolet light from the Sun. The exact makeup remains uncertain, but the substances are thought to be made up of phosphorus, sulfur or possibly hydrocarbons.[58]: 39 [91] These colourful compounds, known as chromophores, mix with the warmer clouds of the lower deck. The light-coloured zones are formed when rising convection cells form crystallising ammonia that hides the chromophores from view.[92] Jupiter has a low axial tilt, thus making it that the poles always receive less solar radiation than the planet's equatorial region. Convection within the interior of the planet transports energy to the poles, balancing out the temperatures at the cloud layer.[49]: 54  Great Red Spot and other vortices Close-up of the Great Red Spot imaged by the Juno spacecraft in April 2018 A well-known feature of Jupiter is the Great Red Spot,[93] a persistent anticyclonic storm located 22° south of the equator. It is known to have existed since at least 1831,[94] and possibly since 1665.[95][96] Images by the Hubble Space Telescope have shown two more "red spots" adjacent to the Great Red Spot.[97][98] The storm is visible through Earth-based telescopes with an aperture of 12 cm or larger.[99] The oval object rotates counterclockwise, with a period of about six days.[100] The maximum altitude of this storm is about 8 km (5 mi) above the surrounding cloud tops.[101] The Spot's composition and the source of its red colour remain uncertain, although photodissociated ammonia reacting with acetylene is a likely explanation.[102] The Great Red Spot is larger than the Earth.[103] Mathematical models suggest that the storm is stable and will be a permanent feature of the planet.[104] However, it has significantly decreased in size since its discovery. Initial observations in the late 1800s showed it to be approximately 41,000 km (25,500 mi) across. By the time of the Voyager flybys in 1979, the storm had a length of 23,300 km (14,500 mi) and a width of approximately 13,000 km (8,000 mi).[105] Hubble observations in 1995 showed it had decreased in size to 20,950 km (13,020 mi), and observations in 2009 showed the size to be 17,910 km (11,130 mi). As of 2015, the storm was measured at approximately 16,500 by 10,940 km (10,250 by 6,800 mi),[105] and was decreasing in length by about 930 km (580 mi) per year.[103][106] In October 2021, a Juno flyby mission measured the depth of the Great Red Spot, putting it at around 300–500 kilometres (190–310 mi).[107] Juno missions show that there are several polar cyclone groups at Jupiter's poles. The northern group contains nine cyclones, with a large one in the centre and eight others around it, while its southern counterpart also consists of a centre vortex but is surrounded by five large storms and a single smaller one for a total of 7 storms.[108][109] These polar structures are caused by the turbulence in Jupiter's atmosphere and can be compared with the hexagon at Saturn's north pole. Formation of Oval BA from three white ovals In 2000, an atmospheric feature formed in the southern hemisphere that is similar in appearance to the Great Red Spot, but smaller. This was created when smaller, white oval-shaped storms merged to form a single feature—these three smaller white ovals were formed in 1939–1940. The merged feature was named Oval BA. It has since increased in intensity and changed from white to red, earning it the nickname "Little Red Spot".[110][111] In April 2017, a "Great Cold Spot" was discovered in Jupiter's thermosphere at its north pole. This feature is 24,000 km (15,000 mi) across, 12,000 km (7,500 mi) wide, and 200 °C (360 °F) cooler than surrounding material. While this spot changes form and intensity over the short term, it has maintained its general position in the atmosphere for more than 15 years. It may be a giant vortex similar to the Great Red Spot, and appears to be quasi-stable like the vortices in Earth's thermosphere. This feature may be formed by interactions between charged particles generated from Io and the strong magnetic field of Jupiter, resulting in a redistribution of heat flow.[112] Magnetosphere Main article: Magnetosphere of Jupiter Aurorae on the north and south poles (animation) Aurorae on the north pole (Hubble) Infrared view of southern lights (Jovian IR Mapper) Jupiter's magnetic field is the strongest of any planet in the Solar System,[92] with a dipole moment of 4.170 gauss (0.4170 mT) that is tilted at an angle of 10.31° to the pole of rotation. The surface magnetic field strength varies from 2 gauss (0.20 mT) up to 20 gauss (2.0 mT).[113] This field is thought to be generated by eddy currents—swirling movements of conducting materials—within the liquid, metallic hydrogen core. At about 75 Jupiter radii from the planet, the interaction of the magnetosphere with the solar wind generates a bow shock. Surrounding Jupiter's magnetosphere is a magnetopause, located at the inner edge of a magnetosheath—a region between it and the bow shock. The solar wind interacts with these regions, elongating the magnetosphere on Jupiter's lee side and extending it outward until it nearly reaches the orbit of Saturn. The four largest moons of Jupiter all orbit within the magnetosphere, which protects them from the solar wind.[58]: 69  The volcanoes on the moon Io emit large amounts of sulfur dioxide, forming a gas torus along its orbit. The gas is ionized in Jupiter's magnetosphere, producing sulfur and oxygen ions. They, together with hydrogen ions originating from the atmosphere of Jupiter, form a plasma sheet in Jupiter's equatorial plane. The plasma in the sheet co-rotates with the planet, causing deformation of the dipole magnetic field into that of a magnetodisk. Electrons within the plasma sheet generate a strong radio signature, with short, superimposed bursts in the range of 0.6–30 MHz that are detectable from Earth with consumer-grade shortwave radio receivers.[114][115] As Io moves through this torus, the interaction generates Alfvén waves that carry ionized matter into the polar regions of Jupiter. As a result, radio waves are generated through a cyclotron maser mechanism, and the energy is transmitted out along a cone-shaped surface. When Earth intersects this cone, the radio emissions from Jupiter can exceed the radio output of the Sun.[116] Planetary rings Main article: Rings of Jupiter Jupiter has a faint planetary ring system composed of three main segments: an inner torus of particles known as the halo, a relatively bright main ring, and an outer gossamer ring.[117] These rings appear to be made of dust, whereas Saturn's rings are made of ice.[58]: 65  The main ring is most likely made out of material ejected from the satellites Adrastea and Metis, which is drawn into Jupiter because of the planet's strong gravitational influence. New material is added by additional impacts.[118] In a similar way, the moons Thebe and Amalthea are believed to produce the two distinct components of the dusty gossamer ring.[118] There is evidence of a fourth ring that may consist of collisional debris from Amalthea that is strung along the same moon's orbit.[119] Orbit and rotation see caption Orbit of Jupiter and other outer Solar System planets Jupiter is the only planet whose barycentre with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius.[120][121] The average distance between Jupiter and the Sun is 778 million km (5.2 AU) and it completes an orbit every 11.86 years. This is approximately two-fifths the orbital period of Saturn, forming a near orbital resonance.[122] The orbital plane of Jupiter is inclined 1.30° compared to Earth. Because the eccentricity of its orbit is 0.049, Jupiter is slightly over 75 million km nearer the Sun at perihelion than aphelion.[7] The axial tilt of Jupiter is relatively small, only 3.13°, so its seasons are insignificant compared to those of Earth and Mars.[123] Jupiter's rotation is the fastest of all the Solar System's planets, completing a rotation on its axis in slightly less than ten hours; this creates an equatorial bulge easily seen through an amateur telescope. Because Jupiter is not a solid body, its upper atmosphere undergoes differential rotation. The rotation of Jupiter's polar atmosphere is about 5 minutes longer than that of the equatorial atmosphere.[124] The planet is an oblate spheroid, meaning that the diameter across its equator is longer than the diameter measured between its poles.[76] On Jupiter, the equatorial diameter is 9,276 km (5,764 mi) longer than the polar diameter.[7] Three systems are used as frames of reference for tracking the planetary rotation, particularly when graphing the motion of atmospheric features. System I applies to latitudes from 7° N to 7° S; its period is the planet's shortest, at 9h 50 m 30.0s. System II applies at latitudes north and south of these; its period is 9h 55 m 40.6s.[125] System III was defined by radio astronomers and corresponds to the rotation of the planet's magnetosphere; its period is Jupiter's official rotation.[126] Observation see caption Jupiter and four Galilean moons seen through an amateur telescope Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon, and Venus),[92] although at opposition Mars can appear brighter than Jupiter. Depending on Jupiter's position with respect to the Earth, it can vary in visual magnitude from as bright as −2.94 at opposition down to −1.66 during conjunction with the Sun.[12] The mean apparent magnitude is −2.20 with a standard deviation of 0.33.[12] The angular diameter of Jupiter likewise varies from 50.1 to 30.5 arc seconds.[7] Favourable oppositions occur when Jupiter is passing through the perihelion of its orbit, bringing it closer to Earth.[127] Near opposition, Jupiter will appear to go into retrograde motion for a period of about 121 days, moving backward through an angle of 9.9° before returning to prograde movement.[128] Because the orbit of Jupiter is outside that of Earth, the phase angle of Jupiter as viewed from Earth is always less than 11.5°; thus, Jupiter always appears nearly fully illuminated when viewed through Earth-based telescopes. It was only during spacecraft missions to Jupiter that crescent views of the planet were obtained.[129] A small telescope will usually show Jupiter's four Galilean moons and the prominent cloud belts across Jupiter's atmosphere. A larger telescope with an aperture of 4–6 in (10.16–15.24 cm) will show Jupiter's Great Red Spot when it faces Earth.[130][131] History Pre-telescopic research Model in the Almagest of the longitudinal motion of Jupiter (☉) relative to Earth (🜨) Observation of Jupiter dates back to at least the Babylonian astronomers of the 7th or 8th century BC.[132] The ancient Chinese knew Jupiter as the "Suì Star" (SuìxÄ«ng 歲星) and established their cycle of 12 earthly branches based on the approximate number of years it takes Jupiter to rotate around the Sun; the Chinese language still uses its name (simplified as æ­²) when referring to years of age. By the 4th century BC, these observations had developed into the Chinese zodiac,[133] and each year became associated with a Tai Sui star and god controlling the region of the heavens opposite Jupiter's position in the night sky. These beliefs survive in some Taoist religious practices and in the East Asian zodiac's twelve animals. The Chinese historian Xi Zezong has claimed that Gan De, an ancient Chinese astronomer,[134] reported a small star "in alliance" with the planet,[135] which may indicate a sighting of one of Jupiter's moons with the unaided eye. If true, this would predate Galileo's discovery by nearly two millennia.[136][137] A 2016 paper reports that trapezoidal rule was used by Babylonians before 50 BCE for integrating the velocity of Jupiter along the ecliptic.[138] In his 2nd century work the Almagest, the Hellenistic astronomer Claudius Ptolemaeus constructed a geocentric planetary model based on deferents and epicycles to explain Jupiter's motion relative to Earth, giving its orbital period around Earth as 4332.38 days, or 11.86 years.[139] Ground-based telescope research Galileo's drawings of Jupiter and its "Medicean Stars" from Sidereus Nuncius In 1610, Italian polymath Galileo Galilei discovered the four largest moons of Jupiter (now known as the Galilean moons) using a telescope. This is thought to be the first telescopic observation of moons other than Earth's. Just one day after Galileo, Simon Marius independently discovered moons around Jupiter, though he did not publish his discovery in a book until 1614.[140] It was Marius's names for the major moons, however, that stuck: Io, Europa, Ganymede, and Callisto. The discovery was a major point in favour of Copernicus' heliocentric theory of the motions of the planets; Galileo's outspoken support of the Copernican theory led to him being tried and condemned by the Inquisition.[141] During the 1660s, Giovanni Cassini used a new telescope to discover spots and colourful bands in Jupiter's atmosphere, observe that the planet appeared oblate, and estimate its rotation period.[142] In 1692, Cassini noticed that the atmosphere undergoes differential rotation.[143] The Great Red Spot may have been observed as early as 1664 by Robert Hooke and in 1665 by Cassini, although this is disputed. The pharmacist Heinrich Schwabe produced the earliest known drawing to show details of the Great Red Spot in 1831.[144] The Red Spot was reportedly lost from sight on several occasions between 1665 and 1708 before becoming quite conspicuous in 1878.[145] It was recorded as fading again in 1883 and at the start of the 20th century.[146] Both Giovanni Borelli and Cassini made careful tables of the motions of Jupiter's moons, which allowed predictions of when the moons would pass before or behind the planet. By the 1670s, Cassini observed that when Jupiter was on the opposite side of the Sun from Earth, these events would occur about 17 minutes later than expected. Ole Rømer deduced that light does not travel instantaneously (a conclusion that Cassini had earlier rejected),[43] and this timing discrepancy was used to estimate the speed of light.[147][148] In 1892, E. E. Barnard observed a fifth satellite of Jupiter with the 36-inch (910 mm) refractor at Lick Observatory in California. This moon was later named Amalthea.[149] It was the last planetary moon to be discovered directly by a visual observer through a telescope.[150] An additional eight satellites were discovered before the flyby of the Voyager 1 probe in 1979.[d] Six years later, the Voyager missions vastly improved the understanding of the Galilean moons and discovered Jupiter's rings. They also confirmed that the Great Red Spot was anticyclonic. Comparison of images showed that the Spot had changed hue since the Pioneer missions, turning from orange to dark brown. A torus of ionized atoms was discovered along Io's orbital path, which were found to come from erupting volcanoes on the moon's surface. As the spacecraft passed behind the planet, it observed flashes of lightning in the night side atmosphere.[49]: 87 [164] The next mission to encounter Jupiter was the Ulysses solar probe. In February 1992, it performed a flyby manoeuvre to attain a polar orbit around the Sun. During this pass, the spacecraft studied Jupiter's magnetosphere, although it had no cameras to photograph the planet. The spacecraft passed by Jupiter six years later, this time at a much greater distance.[162] In 2000, the Cassini probe flew by Jupiter on its way to Saturn, and provided higher-resolution images.[165] The New Horizons probe flew by Jupiter in 2007 for a gravity assist en route to Pluto.[166] The probe's cameras measured plasma output from volcanoes on Io and studied all four Galilean moons in detail.[167] Galileo mission Main article: Galileo (spacecraft) Galileo in preparation for mating with the rocket, 1989 The first spacecraft to orbit Jupiter was the Galileo mission, which reached the planet on December 7, 1995.[54] It remained in orbit for over seven years, conducting multiple flybys of all the Galilean moons and Amalthea. The spacecraft also witnessed the impact of Comet Shoemaker–Levy 9 when it collided with Jupiter in 1994. Some of the goals for the mission were thwarted due to a malfunction in Galileo's high-gain antenna.[168] A 340-kilogram titanium atmospheric probe was released from the spacecraft in July 1995, entering Jupiter's atmosphere on December 7.[54] It parachuted through 150 km (93 mi) of the atmosphere at a speed of about 2,575 km/h (1600 mph)[54] and collected data for 57.6 minutes until the spacecraft was destroyed.[169] The Galileo orbiter itself experienced a more rapid version of the same fate when it was deliberately steered into the planet on September 21, 2003. NASA destroyed the spacecraft in order to avoid any possibility of the spacecraft crashing into and possibly contaminating the moon Europa, which may harbour life.[168] Data from this mission revealed that hydrogen composes up to 90% of Jupiter's atmosphere.[54] The recorded temperature was more than 300 °C (570 °F) and the windspeed measured more than 644 km/h (>400 mph) before the probes vaporized.[54] Juno mission Main article: Juno (spacecraft) see caption Juno preparing for testing in a rotation stand, 2011 NASA's Juno mission arrived at Jupiter on July 4, 2016 with the goal of studying the planet in detail from a polar orbit. The spacecraft was originally intended to orbit Jupiter thirty-seven times over a period of twenty months.[170][64][171] During the mission, the spacecraft will be exposed to high levels of radiation from Jupiter's magnetosphere, which may cause future failure of certain instruments.[172] On August 27, 2016, the spacecraft completed its first fly-by of Jupiter and sent back the first-ever images of Jupiter's north pole.[173] Juno completed 12 orbits before the end of its budgeted mission plan, ending July 2018.[174] In June of that year, NASA extended the mission operations plan to July 2021, and in January of that year the mission was extended to September 2025 with four lunar flybys: one of Ganymede, one of Europa, and two of Io.[175][176] When Juno reaches the end of the mission, it will perform a controlled deorbit and disintegrate into Jupiter's atmosphere. This will avoid the risk of collision with Jupiter's moons.[177][178] Cancelled missions and future plans There is great interest in missions to study Jupiter's larger icy moons, which may have subsurface liquid oceans. Funding difficulties have delayed progress, causing NASA's JIMO (Jupiter Icy Moons Orbiter) to be cancelled in 2005.[179] A subsequent proposal was developed for a joint NASA/ESA mission called EJSM/Laplace, with a provisional launch date around 2020. EJSM/Laplace would have consisted of the NASA-led Jupiter Europa Orbiter and the ESA-led Jupiter Ganymede Orbiter.[180] However, the ESA formally ended the partnership in April 2011, citing budget issues at NASA and the consequences on the mission timetable. Instead, ESA planned to go ahead with a European-only mission to compete in its L1 Cosmic Vision selection.[181] These plans have been realized as the European Space Agency's Jupiter Icy Moon Explorer (JUICE), due to launch in 2023,[182] followed by NASA's Europa Clipper mission, scheduled for launch in 2024.[183] Other proposed missions include the Chinese National Space Administration's Tianwen-4 mission which aims to launch an orbiter to the Jovian system and possibly Callisto around 2035,[184] and CNSA's Interstellar Express[185] and NASA's Interstellar Probe,[186] which would both use Jupiter's gravity to help them reach the edges of the heliosphere. [Privacy Policy]( | [Terms & Conditions]( You’re receiving this email because you’re a reader who opted-in for emails on our sister website. This ad is sent on behalf of Behind The Markets, 4260 NW 1st Avenue, Suite # 55 Boca Raton, FL 33431 – 4264. 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