The Voyagers have set numerous records in their unparalleled journeys. In 2012, Voyager 1, which launched on Sept. 5, 1977, became the only spacecraft to have entered interstellar space. Voyager 2, launched on Aug. 20, 1977, is the only spacecraft to have flown by all four outer planets—Jupiter, Saturn, Uranus and Neptune


Now, 40 years later, Voyager 2 is really, really, really far from Earth. Almost 17 billion kilometers from Earth, and was moving at a velocity of 15.4 km/s (55,000 km/h) relative to the Sun as of December 2014 and is now traveling through the so-called heliosheath passing to interstellar space.