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In addition to the science equipment, there are several cultural artifacts traveling with the spacecraft. These include a collection of 434,738 names stored on a compact disc,[23] a piece of Scaled Composites's SpaceShipOne,[24] and a flag of the USA, along with other mementos.[25]
About 30 grams (1 oz) of Clyde Tombaugh's ashes are aboard the spacecraft, to commemorate his discovery of Pluto in 1930.[26][27] A Florida-state quarter coin, whose design commemorates human exploration, is included, officially as a trim weight.[28] ...
Так зонд мог лететь и 1000 лет и миллион.Разве нельзя оценить время полета по радиоактивным элементам?
PS. Там вон ещё ниже пишут про влияние гравитации звёзд на зонд.Само собой, что экстраполировать траекторию в прошлое надо с учетом этого, а не просто провести прямую линию.
The spacecraft also carried nine mementos to its target of the ninth planet. These were: two U.S. flags, the state quarters of Maryland and Florida, a small piece of the first private manned spacecraft, SpaceShip 1, a CDROM with over 100,000 names being sent to Pluto, another CDROM with numerous pictures of the spacecraft and spacecraft-mission development teams, a 1990 US postage stamp (“Pluto: Not Yet Explored”), and a small amount of the ashes of Pluto’s discoverer, Clyde Tombaugh, whose remains have become the first of a human being on their way to the stars
Пролетаем Плутон с «Новыми Горизонтами»