NASA officials have confirmed that Voyager 1 has been hit by a "tsunami" shock wave from the Sun.
The waves, which hit the craft back in 2013, caused researchers to believe that Voyager 1 had left our sun's bubble and was on its way to interstellar space, according to a release issued by the space agency.
"Normally, interstellar space is like a quiet lake," Ed Stone of the California Institute of Technology in Pasadena, California, the mission's project scientist since 1972, said in a statement.
Voyager 1 and Voyager 2 were launched just 16 days apart back in 1977.
Both crafts were the first man-made objects to explore interstellar region, according to NASA.
"But when our sun has a burst, it sends a shock wave outward that reaches Voyager about a year later. The wave causes the plasma surrounding the spacecraft to sing," according to Stone.
The latest wave to hit the probe proves that it is in interstellar space, which is recognized as the region between the stars and is filled with particles called plasma.
"All is not quiet around Voyager," said Don Gurnett of the University of Iowa, Iowa City, the principal investigator of the plasma wave instrument on Voyager, which collected the definitive evidence that Voyager 1 had left the sun's heliosphere, according to the space agency.
"We're excited to analyze these new data. So far, we can say that it confirms we are in interstellar space," Gurnett added.
Voyager 1 has been hit by three cosmic waves since it entered interstellar space in 2012.
The first was too weak to be detected at the time of the event. NASA was able to detect the second without any issues.
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