1977 – Voyager 1 takes the first distant photograph of the Earth and the Moon together.
Voyager 1 is a space probe launched by NASA on September 5, 1977, as part of the Voyager program to study the outer Solar System and the interstellar space beyond the Sun's heliosphere. It was launched 16 days after its twin,
Voyager 2. The probe made flybys of Jupiter, Saturn, and Saturn's largest moon, Titan. NASA had a choice of either conducting a Pluto or Titan flyby. Exploration of Titan took priority because it was known to have a substantial atmosphere.
Voyager 1 studied the weather, magnetic fields, and rings of the two gas giants and was the first probe to provide detailed images of their moons. As part of the Voyager program and like its sister craft
Voyager 2, the spacecraft's extended mission is to locate and study the regions and boundaries of the outer heliosphere and to begin exploring the interstellar medium. It communicates through the NASA Deep Space Network (DSN) to receive routine commands and to transmit data to Earth. In 2017, the Voyager team successfully fired the spacecraft's trajectory correction maneuver (TCM) thrusters for the first time since 1980, enabling the mission to be extended by two to three years. As of September 2025, NASA's
Voyager 1 is more than 15 billion miles from Earth, making it the most distant human-made object. Because of this vast distance, a radio signal takes over 23 hours to travel from Earth to the spacecraft and another 23 hours to return, a total round-trip time of more than 46 hours.
Voyager 1's extended mission is expected to continue to return scientific data until at least 2025, with a maximum lifespan of until 2030. Its radioisotope thermoelectric generators (RTGs) may supply enough electric power to return engineering data until 2036.
Voyager 1 is projected to reach a distance of one light day from Earth in November of 2026 and is expected to reach the theorized Oort cloud in about 300 years and take about 30,000 years to pass through it.