Editing Voyager 1 (section)

== Exit from the heliosphere ==
[[File:Family portrait (Voyager 1).png|upright=1.81|thumb|alt=A set of gray squares trace roughly left to right. A few are labeled with single letters associated with a nearby colored square. J is near to a square labeled Jupiter; E to Earth; V to Venus; S to Saturn; U to Uranus; N to Neptune. A small spot appears at the center of each colored square|The ''[[Family Portrait (Voyager)|Family Portrait]]'' of the Solar System acquired by ''Voyager 1'', February 14, 1990]]
[[File:Voyager 1 - 14 February 1990.png|thumb|The position of ''Voyager 1'' above the plane of the ecliptic on February 14, 1990, the day ''Family Portrait'' was taken.]]
[[File:Voyager speed and distance from Sun.svg|thumb|''Voyager 1'' and ''2'' speed and distance from the Sun]]
[[File:Pale_Blue_Dot.png|upright=0.9|thumb|The ''[[Pale Blue Dot]]'' image showing Earth from {{convert|6|e9km|e9mi|abbr=off}} appearing as a tiny dot (the bluish-white speck approximately halfway down the light band to the right) within the darkness of deep space.<ref>{{Cite news |last=Staff |date=February 12, 2020 |title=Pale Blue Dot Revisited |work=[[NASA]] |url=https://photojournal.jpl.nasa.gov/catalog/PIA23645 |url-status=live |access-date=February 12, 2020 |archive-url=https://web.archive.org/web/20200212230826/https://photojournal.jpl.nasa.gov/catalog/PIA23645 |archive-date=February 12, 2020}}</ref>]]

On February 14, 1990, ''Voyager 1'' took the first "[[Family Portrait (Voyager)|family portrait]]" of the Solar System as seen from outside,<ref>{{Cite web |title=Photo Caption |url=https://nssdc.gsfc.nasa.gov/photo_gallery/caption/solar_family.txt |url-status=live |archive-url=https://web.archive.org/web/20100908070243/http://nssdc.gsfc.nasa.gov/photo_gallery/caption/solar_family.txt |archive-date=September 8, 2010 |access-date=August 26, 2010 |publisher=Public Information Office}}</ref> which includes the image of planet Earth known as ''[[Pale Blue Dot]]''. Soon afterward, its cameras were deactivated to conserve energy and computer resources for other equipment. The camera software has been removed from the spacecraft, so it would now be complex to get them working again. Earth-side software and computers for reading the images are also no longer available.<ref name="nasa-1990" />

On February 17, 1998, ''Voyager 1'' reached a distance of {{Convert|69|AU|e9mi e9km|abbr=unit}} from the Sun and overtook ''[[Pioneer 10]]'' as the most distant spacecraft from Earth.<ref>{{Cite news |date=February 17, 1998 |title=Voyager 1 now most distant man-made object in space |publisher=CNN |url=http://edition.cnn.com/TECH/space/9802/17/nasa.distant.objects/ |url-status=dead |access-date=July 1, 2012 |archive-url=https://web.archive.org/web/20120620094059/http://edition.cnn.com/TECH/space/9802/17/nasa.distant.objects/ |archive-date=June 20, 2012}}</ref><ref>{{Cite news |last=Clark |first=Stuart |date=September 13, 2013 |title=Voyager 1 leaving solar system matches feats of great human explorers |work=The Guardian |url=https://www.theguardian.com/science/across-the-universe/2013/sep/13/voyager-1-solar-system-great-explorers |url-status=live |access-date=December 18, 2016 |archive-url=https://web.archive.org/web/20190624105328/https://www.theguardian.com/science/across-the-universe/2013/sep/13/voyager-1-solar-system-great-explorers |archive-date=June 24, 2019}}</ref> Traveling at about {{convert|17|km/s|mi/s|abbr=unit}}, it has the fastest heliocentric [[Recessional velocity|recession speed]] of any spacecraft.<ref>{{cite web |title=Voyager – NASA Probe Sees Solar Wind Decline |url=https://voyager.jpl.nasa.gov/news/details.php?article_id=20 |website=voyager.jpl.nasa.gov |access-date=April 4, 2024 |language=en |archive-date=March 8, 2024 |archive-url=https://web.archive.org/web/20240308102436/https://voyager.jpl.nasa.gov/news/details.php?article_id=20 |url-status=live }}</ref>

As ''Voyager 1'' headed for interstellar space, its instruments continued to study the Solar System. Jet Propulsion Laboratory scientists used the [[plasma wave]] experiments aboard ''Voyager 1'' and ''2'' to look for the [[Heliopause (astronomy)|heliopause]], the boundary at which the [[solar wind]] transitions into the [[interstellar medium]].<ref>{{Cite web |title=Voyager 1 in heliopause |url=https://voyager.jpl.nasa.gov/mission/interstellar.html |url-status=live |archive-url=https://web.archive.org/web/20120514175011/http://voyager.jpl.nasa.gov/mission/interstellar.html |archive-date=May 14, 2012 |access-date=August 18, 2013 |publisher=JPL}}</ref> {{as of|2013}}, the probe was moving with a relative velocity to the Sun of about {{convert|38026|mph|km/h|disp=flip|sp=us}}.<ref>{{Cite web |title=Mission Status |url=https://voyager.jpl.nasa.gov/mission/status/ |url-status=live |archive-url=https://web.archive.org/web/20180101025244/https://voyager.jpl.nasa.gov/mission/status/ |archive-date=January 1, 2018 |access-date=February 14, 2020 |publisher=JPL}}</ref><!-- Previous update was September 15, 2013. 14 Feb 2020 update using real-time NASA webpage.-->
With the velocity the probe is currently maintaining, ''Voyager 1'' is traveling about {{convert|325|e6mi|e6km|disp=flip|abbr=unit}} per year,<ref>{{Cite news |last=Wall |first=Mike |date=September 12, 2013 |title=It's Official! Voyager 1 Spacecraft Has Left Solar System |work=Space.com |url=https://www.space.com/22729-voyager-1-spacecraft-interstellar-space.html |url-status=live |access-date=May 30, 2014 |archive-url=https://web.archive.org/web/20160118134211/http://m.space.com/22729-voyager-1-spacecraft-interstellar-space.html |archive-date=January 18, 2016}}</ref> or about one [[light-year]] per 18,000 years.

=== Termination shock ===
[[File:Voyager Path.svg|thumb|upright=0.9|Close flybys of gas giants gave [[gravity assist]]s to both Voyagers]]

Scientists at the [[Johns Hopkins University]] [[Applied Physics Laboratory]] believe that ''Voyager 1'' entered the [[Heliosphere#Termination shock|termination shock]] in February 2003.<ref>{{Cite news |last=Tobin |first=Kate |date=November 5, 2003 |title=Spacecraft reaches edge of Solar System |publisher=CNN |url=http://edition.cnn.com/2003/TECH/space/11/05/voyager.solar.boundary/ |url-status=live |access-date=August 19, 2013 |archive-url=https://web.archive.org/web/20160304101439/http://edition.cnn.com/2003/TECH/space/11/05/voyager.solar.boundary/ |archive-date=March 4, 2016}}</ref> This marks the point where the solar wind slows to subsonic speeds. Some other scientists expressed doubt and discussed this in the journal ''[[Nature (journal)|Nature]]'' of November 6, 2003.<ref>{{Cite journal |last=Fisk |first=Len A. |date=2003 |title=Planetary Science: Over the edge? |url=https://deepblue.lib.umich.edu/bitstream/2027.42/62712/1/426021a.pdf |journal=Nature |volume=426 |issue=6962 |pages=21–22 |bibcode=2003Natur.426...21F |doi=10.1038/426021a |pmid=14603294 |doi-access=free}}</ref> The issue would not be resolved until other data became available, since ''Voyager 1''{{'s}} solar-wind detector ceased functioning in 1990. This failure meant that termination shock detection would have to be inferred from the data from the other instruments on board.<ref>{{Cite journal |last1=Krimigis |first1=S.M. |last2=Decker |first2=R.B. |last3=Hill |first3=M.E. |last4=Armstrong |first4=T.P. |last5=Gloeckler |first5=G. |last6=Hamilton |first6=D.C. |last7=Lanzerotti |first7=L.J. |last8=Roelof |first8=E.C. |date=2003 |title=Voyager 1 exited the solar wind at a distance of ~85 au from the Sun |journal=Nature |volume=426 |issue=6962 |pages=45–48 |bibcode=2003Natur.426...45K |doi=10.1038/nature02068 |pmid=14603311 |s2cid=4393867}}</ref><ref>{{Cite journal |last1=McDonald |first1=Frank B. |last2=Stone |first2=Edward C. |last3=Cummings |first3=Alan C. |last4=Heikkila |first4=Bryant |last5=Lal |first5=Nand |last6=Webber |first6=William R. |date=2003 |title=Enhancements of energetic particles near the heliospheric termination shock |journal=Nature |volume=426 |issue=6962 |pages=48–51 |bibcode=2003Natur.426...48M |doi=10.1038/nature02066 |pmid=14603312 |s2cid=4387317}}</ref><ref>{{Cite journal |last=Burlaga |first=L.F. |date=2003 |title=Search for the heliosheath with Voyager 1 magnetic field measurements |url=https://authors.library.caltech.edu/55625/1/2003-46.pdf |url-status=live |journal=Geophysical Research Letters |volume=30 |issue=20 |pages=n/a |bibcode=2003GeoRL..30.2072B |doi=10.1029/2003GL018291 |archive-url=https://web.archive.org/web/20171202102922/https://authors.library.caltech.edu/55625/1/2003-46.pdf |archive-date=December 2, 2017 |access-date=August 2, 2018 |doi-access=free}}</ref>

In May 2005, a NASA press release said that the consensus was that ''Voyager 1'' was then in the [[heliosheath]].<ref>{{Cite web |date=May 24, 2005 |title=Voyager Enters Solar System's Final Frontier |url=https://www.nasa.gov/vision/universe/solarsystem/voyager_agu.html |url-status=live |archive-url=https://web.archive.org/web/20190509100336/https://www.nasa.gov/vision/universe/solarsystem/voyager_agu.html |archive-date=May 9, 2019 |access-date=August 7, 2007 |publisher=NASA}}</ref> In a scientific session at the [[American Geophysical Union]] meeting in [[New Orleans]] on May 25, 2005, [[Edward C. Stone|Ed Stone]] presented evidence that the craft crossed the termination shock in late 2004.<ref name="voyager crosses termination shock">{{Cite web |title=Voyager crosses termination shock |url=https://voyager.jpl.nasa.gov/mission/interstellar.html |url-status=live |archive-url=https://web.archive.org/web/20120514175011/http://voyager.jpl.nasa.gov/mission/interstellar.html |archive-date=May 14, 2012 |access-date=August 29, 2013}}</ref> This event is estimated to have occurred on December 15, 2004, at a distance of {{Convert|94|AU|e6mi|abbr=unit}} from the Sun.<ref name="voyager crosses termination shock" /><ref>{{Cite web |date=February 2013 |title=Voyager Timeline |url=https://voyager.jpl.nasa.gov/mission/timeline.html |url-status=live |archive-url=https://web.archive.org/web/20131120031107/http://voyager.jpl.nasa.gov/mission/timeline.html |archive-date=November 20, 2013 |access-date=December 2, 2013 |publisher=NASA/JPL}}</ref>

=== Heliosheath ===

On March 31, 2006, [[amateur radio operator]]s from [[AMSAT]] in Germany tracked and received radio waves from ''Voyager 1'' using the {{convert|20|m|ft|0|adj=on|sp=us}} dish at [[Bochum]] with a long integration technique. Retrieved data was checked and verified against data from the [[Deep Space Network]] station at Madrid, Spain. This seems to be the first such amateur tracking of ''Voyager 1''.<ref>{{cite web |title=Voyager 1 received by AMSAT-DL group – Official Website of AMSAT-SM Sweden |url=https://www.amsat.se/2006/04/02/voyager-1-received-by-amsat-dl-group/ |website=amsat.se |access-date=April 5, 2024 |archive-date=April 5, 2024 |archive-url=https://web.archive.org/web/20240405101446/https://www.amsat.se/2006/04/02/voyager-1-received-by-amsat-dl-group/ |url-status=live }}</ref>

It was confirmed on December 13, 2010, that ''Voyager 1'' had passed the reach of the radial outward flow of the [[solar wind]], as measured by the Low Energy Charged Particle device. It is suspected that solar wind at this distance turns sideways because of interstellar wind pushing against the heliosphere. Since June 2010, detection of solar wind had been consistently at zero, providing conclusive evidence of the event.<ref>{{Cite web |date=December 13, 2010 |title=Voyager 1 Sees Solar Wind Decline |url=http://solarsystem.nasa.gov/news/display.cfm?News_ID=36121 |url-status=dead |archive-url=https://web.archive.org/web/20110614073203/http://solarsystem.nasa.gov/news/display.cfm?News_ID=36121 |archive-date=June 14, 2011 |access-date=September 16, 2013 |publisher=NASA}}</ref><ref>{{Cite journal |last1=Krimigis |first1=S.M. |last2=Roelof |first2=E.C. |last3=Decker |first3=R.B. |last4=Hill |first4=M.E. |year=2011 |title=Zero outward flow velocity for plasma in a heliosheath transition layer |journal=Nature |volume=474 |issue=7351 |pages=359–361 |bibcode=2011Natur.474..359K |doi=10.1038/nature10115 |pmid=21677754 |s2cid=4345662}}</ref> On this date, the spacecraft was approximately {{Convert|116|AU|e9km e9mi|abbr=unit}} from the Sun.<ref>{{Cite news |last=Amos |first=Jonathan |date=December 14, 2010 |title=Voyager near Solar System's edge |work=BBC News |url=https://www.bbc.co.uk/news/science-environment-11988466 |url-status=live |access-date=December 21, 2010 |archive-url=https://web.archive.org/web/20211122034204/https://www.bbc.co.uk/news/science-environment-11988466 |archive-date=November 22, 2021}}</ref>

''Voyager 1'' was commanded to change its orientation to measure the sideways motion of the solar wind at that location in space in March 2011 (~33yr 6mo from launch). A test roll done in February had confirmed the spacecraft's ability to maneuver and reorient itself. The course of the spacecraft was not changed. It rotated 70 degrees counterclockwise with respect to Earth to detect the solar wind. This was the first time the spacecraft had done any major maneuvering since the [[Family Portrait (Voyager)|''Family Portrait'' photograph]] of the planets was taken in 1990. After the first roll the spacecraft had no problem in reorienting itself with [[Alpha Centauri]], ''Voyager 1''<nowiki/>'s guide star, and it resumed sending transmissions back to Earth. ''Voyager 1'' was expected to enter interstellar space "at any time". ''Voyager 2'' was still detecting outward flow of solar wind at that point but it was estimated that in the following months or years it would experience the same conditions as ''Voyager 1''.<ref>{{Cite web |last=NASA |title=Voyager – The Interstellar Mission |url=https://voyager.jpl.nasa.gov/news/answer_wind.html |url-status=live |archive-url=https://web.archive.org/web/20130927125706/http://voyager.jpl.nasa.gov/news/answer_wind.html |archive-date=September 27, 2013 |access-date=September 16, 2013 |publisher=NASA}}</ref><ref>{{Cite news |date=March 9, 2011 |title=Voyager: Still dancing 17 billion km from Earth |work=BBC News |url=https://www.bbc.co.uk/news/science-environment-12688246 |url-status=live |access-date=June 20, 2018 |archive-url=https://web.archive.org/web/20180928220350/https://www.bbc.co.uk/news/science-environment-12688246 |archive-date=September 28, 2018}}</ref>

The spacecraft was reported at 12.44° declination and 17.163 hours right ascension, and at an ecliptic latitude of 34.9° (the ecliptic latitude changes very slowly), placing it in the constellation [[Ophiuchus]] as observed from the Earth on May 21, 2011.<ref name="nasa-1990" />

On December 1, 2011, it was announced that ''Voyager 1'' had detected the first [[Lyman series|Lyman-alpha radiation]] originating from the [[Milky Way]] galaxy. Lyman-alpha radiation had previously been detected from other galaxies, but because of interference from the Sun, the radiation from the Milky Way was not detectable.<ref>{{Cite magazine |date=December 1, 2011 |title=Voyager Probes Detect 'invisible' Milky Way Glow |url=https://www.nationalgeographic.com/science/article/111201-voyager-probes-milky-way-light-hydrogen-sun-nasa-space |archive-url=https://web.archive.org/web/20210421164043/https://www.nationalgeographic.com/science/article/111201-voyager-probes-milky-way-light-hydrogen-sun-nasa-space |url-status=dead |archive-date=April 21, 2021 |magazine=National Geographic |access-date=December 4, 2011}}</ref>

NASA announced on December 5, 2011, that ''Voyager 1'' had entered a new region referred to as a "cosmic purgatory". Within this stagnation region, charged particles streaming from the Sun slow and turn inward, and the Solar System's magnetic field is doubled in strength as interstellar space appears to be applying pressure. Energetic particles originating in the Solar System decline by nearly half, while the detection of high-energy electrons from outside increases 100-fold. The inner edge of the stagnation region is located approximately 113 AU from the Sun.<ref>{{Cite news |date=December 6, 2011 |title=Spacecraft enters 'cosmic purgatory' |work=CNN |url=http://lightyears.blogs.cnn.com/2011/12/06/spacecraft-enters-cosmic-purgatory/ |url-status=dead |access-date=December 7, 2011 |archive-url=https://web.archive.org/web/20190607115011/http://lightyears.blogs.cnn.com/2011/12/06/spacecraft-enters-cosmic-purgatory/ |archive-date=June 7, 2019}}</ref>

=== Heliopause ===
NASA announced in June 2012 that the probe was detecting changes in the environment that were suspected to correlate with arrival at the [[Heliopause (astronomy)|heliopause]].<ref>{{Cite web |date=June 18, 2012 |title=NASA Voyager 1 Spacecraft Nears Interstellar Space |url=https://www.space.com/16167-voyager1-spacecraft-interstellar-space.html |url-status=live |archive-url=https://web.archive.org/web/20130705080432/http://www.space.com/16167-voyager1-spacecraft-interstellar-space.html |archive-date=July 5, 2013 |access-date=August 19, 2013 |publisher=Space.com}}</ref> ''Voyager 1'' had reported a marked increase in its detection of charged particles from interstellar space, which are normally deflected by the solar winds within the [[heliosphere]] from the Sun. The craft thus began to enter the interstellar medium at the edge of the Solar System.<ref>{{Cite web |date=June 14, 2012 |title=Data From NASA's Voyager 1 Point to Interstellar Future |url=https://www.nasa.gov/mission_pages/voyager/voyager20120614.html |url-status=live |archive-url=https://web.archive.org/web/20120617040828/http://www.nasa.gov/mission_pages/voyager/voyager20120614.html |archive-date=June 17, 2012 |access-date=June 16, 2012 |publisher=[[NASA]]}}</ref>

''Voyager 1'' became the first spacecraft to cross the heliopause in August 2012, then at a distance of {{Convert|121|AU|mi km|abbr=unit}} from the Sun, although this was not confirmed for another year.<ref name="cook-2013a">{{Cite web |last1=Cook |first1=J.-R.C. |last2=Agle |first2=D.C. |last3=Brown |first3=D. |date=September 12, 2013 |title=NASA Spacecraft Embarks on Historic Journey into Interstellar Space |url=https://www.nasa.gov/mission_pages/voyager/voyager20130912.html |url-status=live |archive-url=https://web.archive.org/web/20200413080742/http://www.nasa.gov/mission_pages/voyager/voyager20130912.html |archive-date=April 13, 2020 |access-date=September 14, 2013 |website=NASA}}</ref><ref name="ghose-2013" /><ref name="cowen-2013" /><ref name="kerr-2013" /><ref name="gurnett-2013" />

As of September 2012, sunlight took 16.89 hours to get to ''Voyager 1'' which was at a distance of 121 AU. The [[apparent magnitude]] of the Sun from the spacecraft was −16.3 (about 30 times brighter than the full Moon).<ref name="peat-2012">{{Cite web |last=Peat |first=Chris |date=September 9, 2012 |title=Spacecraft escaping the Solar System |url=https://www.heavens-above.com/SolarEscape.aspx |url-status=live |archive-url=https://web.archive.org/web/20180511013456/http://www.heavens-above.com/SolarEscape.aspx |archive-date=May 11, 2018 |access-date=March 16, 2014 |publisher=[[Heavens-Above]]}}</ref> The spacecraft was traveling at {{Convert|17.043|km/s|mi/s|abbr=on}} relative to the Sun. At this rate, it would need about 17,565 years to travel a single [[light-year]].<ref name="peat-2012" /> To compare, [[Proxima Centauri]], the closest star to the Sun, is about 4.2 light-years ({{val|2.65|e=5|u=AU}}) distant. If the spacecraft was traveling in the direction of that star, it would take 73,775 years to reach it. ''Voyager 1'' is heading in the direction of the constellation [[Ophiuchus (constellation)|Ophiuchus]].<ref name="peat-2012" />

In late 2012, researchers reported that particle data from the spacecraft suggested that the probe had passed through the heliopause. Measurements from the spacecraft revealed a steady rise since May in collisions with high energy particles (above 70 MeV), which are thought to be [[cosmic ray]]s emanating from [[supernova]] explosions far beyond the Solar System, with a sharp increase in these collisions in late August. At the same time, in late August, there was a dramatic drop in collisions with low-energy particles, which are thought to originate from the Sun.<ref name="wolchover-2012">{{Cite web |last=Wolchover |first=Natalie |date=October 9, 2012 |title=Did NASA's Voyager 1 Spacecraft Just Exit the Solar System? |url=https://www.livescience.com/23822-voyager-spacecraft-solar-system.html |url-status=live |archive-url=https://web.archive.org/web/20131003054345/http://www.livescience.com/23822-voyager-spacecraft-solar-system.html |archive-date=October 3, 2013 |access-date=August 20, 2013 |publisher=livescience}}</ref>

Ed Roelof, space scientist at Johns Hopkins University and principal investigator for the Low-Energy Charged Particle instrument on the spacecraft, declared that "most scientists involved with ''Voyager 1'' would agree that [these two criteria] have been sufficiently satisfied".<ref name="wolchover-2012" /> However, the last criterion for officially declaring that ''Voyager 1'' had crossed the boundary, the expected change in magnetic field direction (from that of the Sun to that of the interstellar field beyond), had not been observed (the field had changed direction by only 2 degrees),<ref name="ghose-2013" /> which suggested to some that the nature of the edge of the heliosphere had been misjudged.

On December 3, 2012, Voyager project scientist Ed Stone of the [[California Institute of Technology]] said, "Voyager has discovered a new region of the heliosphere that we had not realized was there. We're still inside, apparently. But the magnetic field now is connected to the outside. So it's like a highway letting particles in and out."<ref>{{Cite magazine |last=Matson |first=John |date=December 4, 2012 |title=Despite Tantalizing Hints, Voyager 1 Has Not Crossed into the Interstellar Medium |url=https://blogs.scientificamerican.com/observations/2012/12/04/despite-tantalizing-hints-voyager-1-has-not-crossed-into-the-interstellar-medium/ |magazine=Scientific American |access-date=August 20, 2013 |archive-date=March 13, 2013 |archive-url=https://web.archive.org/web/20130313051418/http://blogs.scientificamerican.com/observations/2012/12/04/despite-tantalizing-hints-voyager-1-has-not-crossed-into-the-interstellar-medium/? |url-status=live }}</ref> The magnetic field in this region was 10 times more intense than ''Voyager 1'' encountered before the termination shock. It was expected to be the last barrier before the spacecraft exited the Solar System completely and entered interstellar space.<ref>{{Cite web |date=December 3, 2012 |title=Voyager 1 Can 'Taste' the Interstellar Shore |url=http://news.discovery.com/space/voyager-1-flys-into-a-mystery-magnetic-highway-121203.html |url-status=dead |archive-url=https://web.archive.org/web/20121205081342/http://news.discovery.com/space/voyager-1-flys-into-a-mystery-magnetic-highway-121203.html |archive-date=December 5, 2012 |access-date=September 16, 2013 |website=Discovery News |publisher=Discovery Channel}}</ref><ref>{{Cite web |last=Oakes |first=Kelly |date=December 3, 2012 |title=Voyager 1 is still not out of the Solar System |url=https://blogs.scientificamerican.com/basic-space/2012/12/03/voyager-1-is-still-not-out-of-the-solar-system/ |url-status=live |archive-url=https://web.archive.org/web/20130310144859/http://blogs.scientificamerican.com/basic-space/2012/12/03/voyager-1-is-still-not-out-of-the-solar-system/ |archive-date=March 10, 2013 |access-date=September 16, 2013 |website=Basic Space Blog |publisher=Scientific American}}</ref><ref>{{Cite news |date=December 4, 2012 |title=Voyager 1 probe leaving Solar System reaches 'magnetic highway' exit |work=Daily News & Analysis |agency=Reuters |url=http://www.dnaindia.com/scitech/report_voyager-1-probe-leaving-solar-system-reaches-magnetic-highway-exit12-4-2012-8-04-28-am_1773168%7C |url-status=live |access-date=December 4, 2012 |archive-url=https://web.archive.org/web/20230813133221/https://www.dnaindia.com/technology/report_voyager-1-probe-leaving-solar-system-reaches-magnetic-highway-exit12-4-2012-8-04-28-am_1773168%7C |archive-date=August 13, 2023}}</ref>