In late 70's, extreme rare event was held at the orbits of outer planet of Solar System;Jupiter,Saturn,Uranus, Neptune and Pluto aligned such a way that could possibly for a pair of spacecraft to travel,visit and study about them.
-To take benefits of this once in every 175 years chance,Almost 4 decades later,the rickety old probes still travelling and making discoveries push forward the boundaries of science.
V1:Voyager 1
Launched:5/9/1977
Mass:721.9 kg[1 592/1600 lb]
Current Speed:62,000 kph [38,000 mph]
Distance from Earth in 2015:19.3 billion km[12 billion miles]
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