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Voyager PIA17049_hires image - Coggle Diagram
Voyager 
Voyager 1
Feb 17, 1988
Voyager 1 passes the distance of Pioneer (last transmission was 2007 Pioneer 10 and Pioneer 11, 1998).
Dec 16, 2004
Voyager 1 crosses the termination shock which marks miner inner boundary of heliosphere encountering solar wind.
Nov 9,1980
Voyager 1 encounter Saturn
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March 5,1979
Voyager 1 encounter Jupiter
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Voyager 2
Aug 25, 1989
Voyager 2 reaches Neptune
Aug 13, 2012
Voyager 2 becomes NASA's longest operating mission at 12,758 days of operation
Jan 24, 1986
Voyager 2 encounters Uranus
Dec 10, 2018
Voyager 2 enters interstellar space
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Aug 20, 1977
Voyager 2 launched first, will reach Jupiter and Saturn after Voyager.
July 1, 1972 Project begins named "Mariner Jupiter/ Saturn 1977" renamed to Voyager.
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