The edge of the Solar System. Source: NASA
THE VOYAGER 1 space probe has passed out of our solar system and begun its long journey into interstellar space.
More than 35 years after it launched on a mission to explore the outer planets, NASA's unmanned Voyager spacecraft appears to be in a "new region" of space, a study says.
If confirmed, the mission would mark the first man-made object ever to venture so far.
The Voyager 1 "appears to have travelled beyond the influence of the Sun and exited the heliosphere," or the magnetic bubble of charged particles that surround the solar system, said a statement on the American Geophysical Union's website.
Findings that show a sharp change in cosmic ray activity, dating to August 25, 2012, have been accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union, it said.
Where the Voyager probes are.
Researcher Bill Webber, one of the article's authors, acknowledged that the actual location of the spacecraft - whether in interstellar space or just an unknown region beyond the solar system - remains a matter of debate.
"It's outside the normal heliosphere, I would say that," said Webber, professor emeritus of astronomy at New Mexico State University in Las Cruces, according to the AGU's website.
"We're in a new region. And everything we're measuring is different and exciting."
NASA did not immediately respond requests for comment.
Voyager 1's journey has only just begun. It will spend the next several thousand years headed towards Alpha Centauri.
Voyager 1 and its companion Voyager 2 launched in 1977 on a mission to study planets.
They have both kept going, and both are on track to leave the solar system, NASA has said.
For months, experts have been closely watching for hints that Voyager 1 has left the solar system and most have estimated it would likely happen in the next year or two.
NASA has described Voyager 1 - now 18 billion kilometres away from the Sun - and its companion Voyager 2 as "the two most distant active representatives of humanity and its desire to explore."
The Voyager probe.
NASA says the long-running Voyager 1 spacecraft hurtling toward the edge of the solar system has reached another milestone.
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