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This undated file artist's rendering shows one of NASA's twin Voyager spacecraft. NASA says the long-running Voyager 1 spacecraft hurtling toward the edge of the solar system has reached another milestone. Since 2004, the unmanned probe has been exploring a region of space where the solar wind slows abruptly and crashes into the thin gas between stars. NASA said Monday that recent readings show the solar wind has slowed to zero, meaning the spacecraft is getting ever closer to the solar system's edge. (AP Photo/NASA, File)

NASA's Voyager probes

Nasa's Voyager 1 spacecraft and its sister probe Voyager 2 have been traveling through space since

1977. Voyager 1 — the farthest-flung object created by human hands — has left the solar system forever, a study suggests.