The Voyager-1 spacecraft became the first manmade object to leave the solar system according to NASA.
Experts have confirmed that the probe's instruments indicated it moved beyond the bubble of hot gas from our Sun and is currently moving in the space between our stars.
"This is really a key milestone that we'd been hoping we would reach when we started this project over 40 years ago - that we would get a spacecraft into interstellar space," said Professor Ed Stone, the chief scientist said about the news to BBC News.
The 36-year-old probe is 12 billion miles away from the sun.
The probe is so far away it takes 17 hours for a radio signal to get sent from Voyager to Earth.
Voyager 1 first detected the increased pressure of interstellar space on the heliosphere, which is the bubble of charged particles surrounding the sun, back in 2004.
"Scientifically it's a major milestone, but also historically - this is one of those journeys of exploration like circumnavigating the globe for the first time or having a footprint on the Moon for the first time. This is the first time we've begun to explore the space between the stars," Stone said to BBC News.
Voyager 1 and Voyager 2 launched just weeks apart in 1977 to "study Jupiter, Uranus, and Neptue" according to SPACE.com. After completing its studies, the two probes kept flying toward interstellar space.
Voyager 1 will begin running out of energy in 2020, and around 2025, it will be completely out of power.
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