Editing Voyager 1 (section)

=== 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>