- Jul 5, 2009
The Voyager 2 probe, which left Earth in 1977, has become the second human-made object to leave our Solar System.
The news was revealed at the American Geophysical Union (AGU) meeting in Washington.
And the chief scientist on the mission, Prof Edward Stone, confirmed it.
He said both probes had now "made it into interstellar space" and that Voyager 2's date of departure from the Solar System was 5 November 2018.
On that date, the steady stream of particles emitted from the Sun that were being detected by the probe suddenly dipped.
Voyager 2 present location is some 18 billion km (11 billion miles) from Earth. It is moving at roughly 54,000km/h (34,000mph; with respect to the Sun).
Voyager 1 is further and faster still, at 22 billion km and 61,000km/h.
The Voyagers were sent initially to study the outer planets, but then just kept on going.
Prof Stone said that at the start of the mission the team had no idea how long it would take them to reach the edge of the heliosphere - the bubble of particles and magnetic field from our Sun.