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Europa, taken from Voyager 1 to Jupiter

Europa, taken from Voyager 1 to Jupiter

Range : 5.9 million kilometers (3.66 million miles) Europa is Jupiter's 2nd Galilean satellites from the planet and the brightest. Photo taken early morning through violet filter. Faint swirls and linear patt... More

Jupiter as seen by Voyager 1, mosic of Great Red Spot.  (JPL ref. No. P-21203) ARC-1979-AC79-7012

Jupiter as seen by Voyager 1, mosic of Great Red Spot. (JPL ref. No. ...

Jupiter as seen by Voyager 1, mosic of Great Red Spot. (JPL ref. No. P-21203)

P-21738 BW Raange: 4.76 million kilometers (2.9 million miles) This Voyager 2 picture of Io was taken in ultraviolet light and shows one of the volcanic eruption plumes first photographed by Voyager 1. (the bright spot on the right limb) The plume is more than 200 kilometers (124 miles) high. The volcano apparently has been erupting since it was observed by Voyager 1 in March, 1979. This suggests that the volcanoes on Io probably are in continuous eruption. ARC-1979-A79-7073

P-21738 BW Raange: 4.76 million kilometers (2.9 million miles) This Vo...

P-21738 BW Raange: 4.76 million kilometers (2.9 million miles) This Voyager 2 picture of Io was taken in ultraviolet light and shows one of the volcanic eruption plumes first photographed by Voyager 1. (the bri... More

Photo by Voyager 1 Jupiter's satellite Io poses before the giant planet in this photo returned Jan 17, 1979 from a distance of 29 million miles (47 million kilometers). The satellite's shadow can be seen falling on the face of Jupiter at left. Io is traveling from left to right in its one-and-three-quarter-day orbit around Jupiter. Even from this great distance the image of Io shows dark poles and bright equatorial region. Voyager 1 will make its closest approach to Jupiter  174, 000 miles (280,000 kilometer) on March 5. It will then continue to Saturn in November 1980. This color photo was assembled at Jet Propulsion Laboratory's Image Processing Lab from three black and white images taken through filters. The Voyagers are managed for NASA's Office of Space Science by Jet Propulsion Laboratory. (JPL Ref: P-20946C) ARC-1979-AC79-0143-4

Photo by Voyager 1 Jupiter's satellite Io poses before the giant plane...

Photo by Voyager 1 Jupiter's satellite Io poses before the giant planet in this photo returned Jan 17, 1979 from a distance of 29 million miles (47 million kilometers). The satellite's shadow can be seen fallin... More

Range :  34 million km. ( 21.1 million miles) P-22993C This Voyager 1 photograph of Saturn was taken on the last day it could be captured within a single narrow angle camera frame as the spacecraft neared the planet for it's closest approach on Nov. 12, 1980. Dione, one of Saturn's innermost satellites, appears as three color spots just below  the planet's south pole. An abundance of previously unseen detail is apparent in the rings. For example, a gap in the dark, innermst ring, C-ring or Crepe Ring, is clearly shown. Also, material is seen inside the relatively wide Cassini Division, seperating  the middle, B-ring from the outermost ring, the A-ring. The Encke division is shown near the outer edge of A-ring. The detail in the ring's shadows cast on the planet is of particular interest. The broad dark band near the equator is the shadow of B-ring. The thinner, brighter line just to the south is the shadow  of the less dense A-ring. ARC-1980-AC80-7003

Range : 34 million km. ( 21.1 million miles) P-22993C This Voyager 1 ...

Range : 34 million km. ( 21.1 million miles) P-22993C This Voyager 1 photograph of Saturn was taken on the last day it could be captured within a single narrow angle camera frame as the spacecraft neared the p... More

Voyager, 1977-Present. NASA public domain image colelction.

Voyager, 1977-Present. NASA public domain image colelction.

Image Credit: NASA..Description Launched August 20, 1977 and November 5, 1977. The Voyager-1 and Voyager-2 are a pair of interstellar probes designed to study the outer solar system and then interstellar space.... More

Voyager 1 spacecraft Jupiter moon Ganymede ARC-1979-A79-7120

Voyager 1 spacecraft Jupiter moon Ganymede ARC-1979-A79-7120

Voyager 1 spacecraft Jupiter moon Ganymede

Europa , the smallest of the Galilean satellites, or Moons , of Jupiter ,  is seen here as taken by Voyager 1.  Range : 2 million km (1.2 million miles) is centered at about the 300 degree Meridian.  The bright areas are probably ice deposits, while the dark may be rocky surface or areas of more patchy ice distribution.  Most unusual features are systems of linear structures crossing the surface in various directions. Of these, some of which are over 1000 km. long , & 2 or 3 hundred km. wide,  may be faults which have disrupted the surface. ARC-1979-AC79-7003

Europa , the smallest of the Galilean satellites, or Moons , of Jupite...

Europa , the smallest of the Galilean satellites, or Moons , of Jupiter , is seen here as taken by Voyager 1. Range : 2 million km (1.2 million miles) is centered at about the 300 degree Meridian. The bright... More

Range :  6 Million km. ( 3.72 million miles ) This photograph of Jupiter, shot from Voyager 2, shows the equator to the southern polar latitudes, near the Great Red Spot. The white oval that appears here is different from the one seen in a similiar position when voyager 1  passed years before. The region of white clouds now extends from east of The Red Spot and around it's northern boundary, preventing small cloud vortices from circling the feature. The disturbed region west of The Red Spot has also changed since Voyager1. It shows more small scale structure and cloud vortices being formed out of the wave structures. ARC-1979-AC79-7102

Range : 6 Million km. ( 3.72 million miles ) This photograph of Jupit...

Range : 6 Million km. ( 3.72 million miles ) This photograph of Jupiter, shot from Voyager 2, shows the equator to the southern polar latitudes, near the Great Red Spot. The white oval that appears here is dif... More

A diagram of the solar system. Solar system space bow shock.

A diagram of the solar system. Solar system space bow shock.

The Sun. Free images of The Sun. Artworks and photographs, available for commercial use and free download. Copyright-free, no attribution required. A diagram of the solar system

Jupiter as seen by Voyager 1, mosaic of planet. (JPL ref. No. P-21147) ARC-1979-AC79-7009

Jupiter as seen by Voyager 1, mosaic of planet. (JPL ref. No. P-21147)...

Jupiter as seen by Voyager 1, mosaic of planet. (JPL ref. No. P-21147)

P-21749 C Range: 6 million kilometers (4 million miles) This photograph of Ganymede, the largest satellite of Jupiter, is shown at approximately the same distance as that photographed at close range by Voyager 1 in March. This picture, taken by Voyager 2, illustrates well the light, bluish regions near the north and south poles. It is known that there is exposed water ice on the surface of Ganymede, and pehaps these polar caps are composed of a light covering of water ice or frost. Voyager 2 will pass within 63,000 kilometers (39,000 miles) of Ganymede. ARC-1979-AC79-7082

P-21749 C Range: 6 million kilometers (4 million miles) This photograp...

P-21749 C Range: 6 million kilometers (4 million miles) This photograph of Ganymede, the largest satellite of Jupiter, is shown at approximately the same distance as that photographed at close range by Voyager ... More

P-21746 BW Range: 390,000 kilometers (245,000 miles) This photomosaic of Callisto is composed of nine frames. The impact crater distribution is very uniform across the disk. Notable are the very bright rayed craters that probably are very young. Near the limb is a giant probable impact structure. Several large structures were discovered by Voyager 1. This one is smaller than the largest one found by Voyager 1 but is more clearly shown. About 15 concentric rings surround the bright central spot. Many hundreds of moderate sized impacts are also seen, a few with bright radial ray patterns. The limb is very smooth confirming that no high topography has been seen on the satellite, and observation consistent with its icy composition. ARC-1979-A79-7080

P-21746 BW Range: 390,000 kilometers (245,000 miles) This photomosaic ...

P-21746 BW Range: 390,000 kilometers (245,000 miles) This photomosaic of Callisto is composed of nine frames. The impact crater distribution is very uniform across the disk. Notable are the very bright rayed cr... More

Voyager in Space Artist Concept

Voyager in Space Artist Concept

This artist concept shows NASA Voyager spacecraft against a backdrop of stars. NASA/JPL-Caltech

Photo by Voyager 1 (JPL) Jupiter, its Great Red Spot and three of its four largest satellites are visible in this photo taken Feb 5, 1979 by Voyager 1. The spacecraft was 28.4 million kilomters (17.5 million miles) from the planet at the time. The inner-most large satellite, Io, can be seen against Jupiter's disk. Io is distinguished by its bright, brown-yellow surface. To the right of Jupiter is the satellite Europa, also very bright but with fainter surface markings. The darkest satellite, Callisto (still nearly twice as bright as Earth's Moon), is barely visible at the bottom left of the picture. Callisto shows a bright patch in its northern hemisphere. All tThree orbit Jupiter in the equatorial plane, and appear in their present position because Voyageris above the plane. All three satellites show the same face to Jupiter always -- just as Earth's Moon always shows us the same face. In this photo we see the sides of the satellites that always face away from the planet. Jupiter's colorfully banded atmosphere displays complex patterns highlighted by the Great Red Spot, a large, circulating atmospheric disturbance. This photo was assembled from three black and white negatives by the Image Processing Lab at Jet Propulsion Laboratory. JPL manages and controls the Voyage Project for NASA's Office of Space Science. (ref: P-21083) ARC-1969-AC79-0164-2

Photo by Voyager 1 (JPL) Jupiter, its Great Red Spot and three of its ...

Photo by Voyager 1 (JPL) Jupiter, its Great Red Spot and three of its four largest satellites are visible in this photo taken Feb 5, 1979 by Voyager 1. The spacecraft was 28.4 million kilomters (17.5 million mi... More

Jupiter as seen by Voyager 1, mosaic of Jupiter's Satellite Io.  (JPL ref. No. P-21206) ARC-1979-A79-7015

Jupiter as seen by Voyager 1, mosaic of Jupiter's Satellite Io. (JPL ...

Jupiter as seen by Voyager 1, mosaic of Jupiter's Satellite Io. (JPL ref. No. P-21206)

P-21757 BW Range: 2 million kilometers (1.25 million miles) Jupiter's thin ring of particles was photographed by Voyager 2 on its approach to the giant planet. The spacecraft was 2.5° above the plane of the ring. Segments of both sides of the faint ring were captured in this picture. The ring was first photographed in an edge-on configuration by Voyager 1 and was measured then to have a radial extent of about 55, 000 kilometers (34,000 miles) from Jupiter's cloud tops. With this picture, it is possible to determine that the ring is much narrower radially than the individual rings of Saturn. This image has had an extreme contrast enhancement process applied to it which brought out some white blotches in the central region and makes the ring appear discontinuous and non-uniform in brightness. These effects are all artifacts of the processing. ARC-1979-A79-7086

P-21757 BW Range: 2 million kilometers (1.25 million miles) Jupiter's ...

P-21757 BW Range: 2 million kilometers (1.25 million miles) Jupiter's thin ring of particles was photographed by Voyager 2 on its approach to the giant planet. The spacecraft was 2.5° above the plane of the ri... More

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Europa). Io is about 350,000 kilometers (220,000 miles) above Jupiter's Great Red Spot; Europa is about 600,000 kilometers (375,000 miles) above Jupiter's clouds. Although both satellites have about the same brightness, Io's color is very different from Europa's. Io's equatorial region show two types of material -- dark orange, broken by several bright spots -- producing a mottled appearance. The poles are darker and reddish. Preliminary evidence suggests color variations within and between the polar regions.  Io's surface composition is unknown, but scientists believe it may be a mixture of salts and sulfur.  Erupoa is less strongly colored, although still relatively dark at short wavelengths. Markings on Eruopa are less evident that on the other satellites, although this picture shows darker regions toward the trailing half of the visible disk. Jupiter at this point is about 20 million kilometers (12.4 million miles) from the spacecraft.  At this resolution (about 400 kimometers or 250 miles) there is evidence of circular motion in Jupiter's atmosphere. While the dominant large-scale motions are west-to-east, small-scale movement includes eddy-like circulation within and between the bands.  (JPL ref: P-21082) ARC-1979-AC79-0164-1

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Eu...

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Europa). Io is about 350,000 kilometers (220,000 miles) above Jupiter's Great Red Spot; Europa is about 600,000 kilometers (375,000 miles) abo... More

Voyager 1's look at Jupiter's moon Io JPL ref No. P-21457 ARC-1979-AC79-7114

Voyager 1's look at Jupiter's moon Io JPL ref No. P-21457 ARC-1979-AC7...

Voyager 1's look at Jupiter's moon Io JPL ref No. P-21457

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL - no available ARC-1979-A79-7116

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL - no avai...

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL - no available

P-21751 C Range: 1.2 million kilometers This Voyager 2 color photo of Ganymede, the largest Galilean satellite, shows a large dark circular feature about 3200 kilometers in diameter with narrow closely-spaced light bands traversing its surface. The bright spots dotting the surface are relatively recent impact craters, while the lighter circular areas may be older impact areas. The light branching bands are ridged and grooved terrain first seen on Voyager 1 and are younger than the more heavily cratered dark regions. The nature of the brightish region covering the northern part of the dark circular fature is uncertain, but it may be some type of condensate. Most of the features seen on the surface of Ganymede are probably both internal and external responses of the very thick icy layer which comprises the crust of this satellite. ARC-1979-AC79-7083

P-21751 C Range: 1.2 million kilometers This Voyager 2 color photo of ...

P-21751 C Range: 1.2 million kilometers This Voyager 2 color photo of Ganymede, the largest Galilean satellite, shows a large dark circular feature about 3200 kilometers in diameter with narrow closely-spaced l... More

Saturn and its Rings, Voyager Program, NASA/JPL Photo

Saturn and its Rings, Voyager Program, NASA/JPL Photo

Saturn and its Rings NASA/JPL Public domain photograph of a solar system, planet, space exploration, free to use, no copyright restrictions image - Picryl description

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Europa). Io is about 350,000 kilometers (220,000 miles) above Jupiter's Great Red Spot; Europa is about 600,000 kilometers (375,000 miles) above Jupiter's clouds. Although both satellites have about the same brightness, Io's color is very different from Europa's. Io's equatorial region show two types of material -- dark orange, broken by several bright spots -- producing a mottled appearance. The poles are darker and reddish. Preliminary evidence suggests color variations within and between the polar regions.  Io's surface composition is unknown, but scientists believe it may be a mixture of salts and sulfur.  Erupoa is less strongly colored, although still relatively dark at short wavelengths. Markings on Eruopa are less evident that on the other satellites, although this picture shows darker regions toward the trailing half of the visible disk. Jupiter at this point is about 20 million kilometers (12.4 million miles) from the spacecraft.  At this resolution (about 400 kimometers or 250 miles) there is evidence of circular motion in Jupiter's atmosphere. While the dominant large-scale motions are west-to-east, small-scale movement includes eddy-like circulation within and between the bands.  (JPL ref: P-21082) ARC-1979-A79-0164-1

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Eu...

Voyager 1 Image of Jupiter and two of its satellites (Io, left, and Europa). Io is about 350,000 kilometers (220,000 miles) above Jupiter's Great Red Spot; Europa is about 600,000 kilometers (375,000 miles) abo... More

Voyager 1 close up image of Jupiter moon Io JPL ref. No. P-21277 ARC-1979-AC79-7112

Voyager 1 close up image of Jupiter moon Io JPL ref. No. P-21277 ARC-1...

Voyager 1 close up image of Jupiter moon Io JPL ref. No. P-21277

P-21749 BW Range: 6 million kilometers (4 million miles) This photograph of Ganymede, the largest satellite of Jupiter, is shown at approximately the same distance as that photographed at close range by Voyager 1 in March. This picture, taken by Voyager 2, illustrates well the light, bluish regions near the north and south poles. It is known that there is exposed water ice on the surface of Ganymede, and pehaps these polar caps are composed of a light covering of water ice or frost. Voyager 2 will pass within 63,000 kilometers (39,000 miles) of Ganymede. ARC-1979-A79-7082

P-21749 BW Range: 6 million kilometers (4 million miles) This photogra...

P-21749 BW Range: 6 million kilometers (4 million miles) This photograph of Ganymede, the largest satellite of Jupiter, is shown at approximately the same distance as that photographed at close range by Voyager... More

P-21756 BW only Range: 120,000 km (right)  169,000 km (left) Right: In the foreground of this picture taken by Voyager 2, the part of the surface of Ganymede shown is the typical grooved terrain as seen by Voyager 1. It consists of mutually intersecting bands of closely-spaced, parallel ridges and grooves. In the background is newly-cratered dark terrain across which can be traced several widely spaced parellel linear features. When viewed from a distance the line features appear to trace broad circular areas. The features resemble the circular ridges on Callisto that surround an almost complete annealed impact basin. The feature on Ganymede may be of similar origin but all traces of the impact itself have been destroyed. Left:  This picture of Ganymede shows that the dark contrast terrain is separated by bright bands of grooved terain. The band of closely spaced linear grooves in the foreground is 150 km across and appears to be offset by another narrow band at right angles, as though by faulting. A variety of ray patterns are seen around the craters. One is in the left of the picture, it has prominent dark rays around an inner bright halo. Other craters have dark haloes; others have diffuse bright rays. The variation of albedo patterns around the craters may be indications of layering in the surface materials. The intensity of the craters suggests the dark areas are extremely old. The bright grooved terrain is less cratered and probably somewhat younger. ARC-1979-A79-7085

P-21756 BW only Range: 120,000 km (right) 169,000 km (left) Right: In...

P-21756 BW only Range: 120,000 km (right) 169,000 km (left) Right: In the foreground of this picture taken by Voyager 2, the part of the surface of Ganymede shown is the typical grooved terrain as seen by Voya... More

NASA Launch Vehicles, Voyager Project

NASA Launch Vehicles, Voyager Project

The Voyager 1 aboard the Titan III/Centaur lifted off on September 5, 1977, joining its sister spacecraft, the Voyager 2, on a mission to the outer planets.

Voyager 1 views of Jupiter's rings ARC-1981-A79-7119

Voyager 1 views of Jupiter's rings ARC-1981-A79-7119

Voyager 1 views of Jupiter's rings Public domain photograph of NASA experimental aircraft development, free to use, no copyright restrictions image - Picryl description

Jupiter System Montage, Voyager Program, NASA/JPL Photo

Jupiter System Montage, Voyager Program, NASA/JPL Photo

(March 1979) Jupiter and its four planet-size moons, called the Galilean satellites, were photographed in early March 1979 by Voyager 1 and assembled into this collage. They are not to scale but are in their re... More

Photo by Voyager 1 (JPL) The spacecraft took this photo of the planet Jupiter on Jan 24, while still more than 25 million miles (40 million kilometers) away. As the spacecraft draws closer to the planet (about 1 million kilometers a day) more details are emergng in the turbulent clouds. The Great Red Spot shows prominently below center, surrounded by what scientists call a remarkably complex region of the giant planet's atmosphere. An elongated yellow cloud within the Great Red Spot is swirling around the spot's interior boundary in a counterclockwise direction with a period of a little less than six days, confirming the whirlpool-like circulation that astronomers have suspected from ground-based photographs. Ganymede, Jupiter's largest satellite, can be seen to the lower left of the planet. Ganymede is a planet-sized body larger than Mercury. This color photo was assembled at Jet Propulsion Laboratory's Image Processing Lab from there black and white images taken through filters. The Voyagers are managed for NASA's Office of Space Science by Jet Propulsion Laboratory.  (ref: P-20945C  Mission Image 1-9) ARC-1979-AC79-0143-3

Photo by Voyager 1 (JPL) The spacecraft took this photo of the planet ...

Photo by Voyager 1 (JPL) The spacecraft took this photo of the planet Jupiter on Jan 24, while still more than 25 million miles (40 million kilometers) away. As the spacecraft draws closer to the planet (about ... More

Voyager 1 view Io in its orbit around Jupiter ARC-1979-A79-7115

Voyager 1 view Io in its orbit around Jupiter ARC-1979-A79-7115

Voyager 1 view Io in its orbit around Jupiter

P-21752 BW Range: 1.2 million kilometers This image of Europa shows detail about 20 kilometers across and is somewhat higher resolution than the best Voyager 1 image. The part of Europa shown is the hemisphere that will be viewed at even higher resolution during another Voyager 2 encounter with Europa. Color reconstruction in this image was slightly enhanced to bring out detail in the complicated mottled region on the west limb, containing some of the linear fracture-like features discovered by Voyager 1. The regions in the north and south polar areas which appear bluish in this version are in fact white. ARC-1979-A79-7084

P-21752 BW Range: 1.2 million kilometers This image of Europa shows de...

P-21752 BW Range: 1.2 million kilometers This image of Europa shows detail about 20 kilometers across and is somewhat higher resolution than the best Voyager 1 image. The part of Europa shown is the hemisphere ... More

P-21752 C Range: 1.2 million kilometers This image of Europa shows detail about 20 kilometers across and is somewhat higher resolution than the best Voyager 1 image. The part of Europa shown is the hemisphere that will be viewed at even higher resolution during another Voyager 2 encounter with Europa. Color reconstruction in this image was slightly enhanced to bring out detail in the complicated mottled region on the west limb, containing some of the linear fracture-like features discovered by Voyager 1. The regions in the north and south polar areas which appear bluish in this version are in fact white. ARC-1979-AC79-7084

P-21752 C Range: 1.2 million kilometers This image of Europa shows det...

P-21752 C Range: 1.2 million kilometers This image of Europa shows detail about 20 kilometers across and is somewhat higher resolution than the best Voyager 1 image. The part of Europa shown is the hemisphere t... More

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL ref No. P-21334 ARC-1979-AC79-7113

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL ref No. P...

Voyager 1 catches volcanic eruption on Jupiter's moon Io JPL ref No. P-21334

Voyager spacecraft. NASA public domain image colelction.

Voyager spacecraft. NASA public domain image colelction.

Artist's concept of Voyager in flight Public domain photograph of a satellite, space exploration, NASA artwork, free to use, no copyright restrictions image - Picryl description Public domain photograph of NA... More

PIA17461 Heading toward Gliese 445 (annotated)

PIA17461 Heading toward Gliese 445 (annotated)

At the center of this image is the star AC +79 3888, also known as Gliese 445, located 17.6 light-years from Earth. NASA's Voyager 1 spacecraft, which is on a trajectory out of our solar system, is headed towa... More

Solar wind at Voyager 1 cut out

Solar wind at Voyager 1 cut out

Readings from LA1 instrument on Voyager 1 consisting of collisions of greater than 0.5 MeV/nuc nuclei, principally protons, and is sensitive to low-energy phenomena in interplanetary space

AC +79 3888

AC +79 3888

AC +79 3888 The final destination of Voyager 1 中文:AC +79 3888恒星——航海家1号的最终目的地。

Very proxima inv

Very proxima inv

Labeled diagram of linear distances from Sun to Proxima Centauri, with detailed amplification for main Solar System objects, in light over dark color scheme.

Very proxima

Very proxima

Labeled diagram of linear distances from Sun to Proxima Centauri, with detailed amplification for main Solar System objects.

Solar wind at Voyager 1

Solar wind at Voyager 1

Readings from LA1 instrument on Voyager 1 consisting of collisions of greater than 0.5 MeV/nuc nuclei, principally protons, and is sensitive to low-energy phenomena in interplanetary space

Cosmic Rays at Voyager 1

Cosmic Rays at Voyager 1

This plot shows a dramatic increase in the rate of cosmic ray particle detection by the Voyager 1 spacecraft.

PIA17461 Heading toward Gliese 445

PIA17461 Heading toward Gliese 445

At the center of this image is the star AC +79 3888, also known as Gliese 445, located 17.6 light-years from Earth. NASA's Voyager 1 spacecraft, which is on a trajectory out of our solar system, is headed towa... More

Saturn rings Voyager-1

Saturn rings Voyager-1

Saturns rings, seen from Voyager 1

Heliosphere Nose Radio Emissions

Heliosphere Nose Radio Emissions

The intense radio emissions in the 2-3 kHz range from the direction of the nose of the heliosphere which was observed by both Voyager probes.

Transitional regions

Transitional regions

This diagram about the helioshere was released on June 28, 2013 and incorporates results from the Voyager spacecraft