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Voyager 1
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''Voyager 1'' is a space probe launched by NASA on September 5, 1977. Part of the Voyager program to study the outer Solar System, ''Voyager 1'' launched 16 days after its twin, ''Voyager 2''. Having operated for , the spacecraft still communicates with the Deep Space Network to receive routine commands and return data. At a distance of as of autumn 2015, it is the farthest spacecraft from Earth and the only one in interstellar space.
The probe's primary mission objectives included flybys of Jupiter, Saturn, and Saturn's large moon, Titan. While the spacecraft's course could have been altered to include a Pluto encounter by forgoing the Titan flyby, exploration of the moon, which was known to have a substantial atmosphere, took priority.〔〔(【引用サイトリンク】 title=New Horizons conducts flyby of Pluto in historic Kuiper Belt encounter )〕〔(【引用サイトリンク】 title=What If Voyager Had Explored Pluto? )〕 It studied the weather, magnetic fields, and rings of the two planets and was the first probe to provide detailed images of their moons.
After completing its primary mission with the flyby of Saturn on November 20, 1980, ''Voyager 1'' began an extended mission to explore the regions and boundaries of the outer heliosphere. On August 25, 2012, ''Voyager 1'' crossed the heliopause to become the first spacecraft to enter interstellar space and study the interstellar medium. ''Voyager 1s extended mission is expected to continue until around 2025, when its radioisotope thermoelectric generators will no longer supply enough electric power to operate any of its scientific instruments.
== Mission background ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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