Voyager 1 launched on 5 September 1977, two weeks after its twin, Voyager 2.
The probe made groundbreaking visits to Jupiter and Saturn and their moons before heading out of the ecliptic plane (the plane in which most of the planets orbit the Sun) on a journey that will take it into interstellar space.
Voyager 1 is the most distant manmade object and is still returning information about the Solar System's edge. Like Voyager 2, it carries greetings and a gold record of Earth sounds and music in case an intelligent life form finds it.
Photo: Artist's concept of Voyager (NASA/JPL)
The Earth's ambassador to the stars is far from home.
Earth is a tiny blue dot when viewed from the edge of the Solar System.
In 1990, 13 years after leaving the Earth and at a distance of 3.7 billion miles, Voyager 1 turned around to face the Sun and captured images of most of the planets, including the Earth. Voyager scientist Carl Sagan described our planet as a "blue dot".
The probe discovers the most volcanically active body in the Solar System.
NASA scientists were surprised to find that Io is the Solar System's most volcanically active body. The Voyager probes, launched in 1977, showed them Io's numerous volcanoes. The constant sulphur eruptions across Io's surface are powered by Jupiter's strong gravitational attraction, which heats the interior of the moon.
The first detailed views of Jupiter surprise Voyager scientists.
Voyager 1, launched in 1977, sent back its first images of Jupiter in the late 1970s while it was still 50 million miles away from the planet. The gas giant's bizarre clouds and storms puzzled experts.
Jupiter's moons aren't the cold, dead worlds the experts expected.
Voyager scientists thought Jupiter's moons would be cold, dead worlds. They were amazed when the first close-up images from the spacecraft revealed four moons, each different from the next. The probes were launched in 1977.
Sir Patrick Moore is amazed by the detail of Voyager 1's images.
Early in Voyager 1's mission, Sir Patrick Moore and his guest Dr Garry Hunt of University College London discussed some of the probe's findings, which included a ring around Jupiter and images of Jupiter's moons Amalthea, Callisto, Io, Europa and Ganymede. Since Sir Patrick and Dr Hunt spoke, Jupiter has been found to have three faint rings.
Voyager 1 is a 722-kilogram (1,592 lb) space probe launched by NASA on September 5, 1977, to study the outer Solar System. Operating for 36 years, 11 months and 23 days as of August 28, 2014, the spacecraft communicates with the Deep Space Network to receive routine commands and return data. At a distance of about 128.26 AU (1.919×1010 km) from Earth as of August 9, 2014, it is the farthest spacecraft from Earth.
The primary mission ended on November 20, 1980, after encounters with the Jovian system in 1979 and the Saturnian system in 1980. It was the first probe to provide detailed images of the two planets and their moons. As part of the Voyager program, like its sister craft Voyager 2, the spacecraft is in an extended mission to locate and study the regions and boundaries of the outer heliosphere, and finally to begin exploring the interstellar medium.
On September 12, 2013, NASA announced that Voyager 1 had crossed the heliopause and entered interstellar space on August 25, 2012, making it the first spacecraft to do so. As of 2013[update], the probe was moving with a relative velocity to the Sun of about 17 km/s. With the velocity the probe is currently maintaining, Voyager 1 is traveling at about 520 million kilometers per year (325 million miles per year). On July 7, 2014, NASA reported Voyager 1 experienced a new third "tsunami wave", generated from activity (coronal mass ejections) on the sun, further confirming that the probe is in interstellar space. Voyager 1 is expected to continue its mission until 2025, when its generators will no longer supply enough power to operate any of its instruments.
On December 4, 2013, NASA presented the Voyager Project scientist Ed Stone with a NASA Distinguished Public Service Medal and 2014 Howard Hughes Memorial Award by Aero Club of Southern California.