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Michael Zey
r journey from Earth believe Voyager 1 has gone through a region known astermination shock, some 8.7 billion miles from the Sun, and entered an area called the heliosheath. The Voyager 1 spacecraft is pictured here in an undated photo from NASA. Photo by Reuters (Handout) Email Photo Print Photo

NASA's Voyager 1 has reached the final frontier of our solar system, having traveled through a turbulent place where electrically charged particles from the Sun crash into thin gas from interstellar space. Astronomers tracking the little spaceship's 26-year journey from Earth believe Voyager 1 has gone through a region known astermination shock, some 8.7 billion miles from the Sun, and entered an area called the heliosheath. The Voyager 1 spacecraft is pictured here in an undated photo from NASA. Photo by Reuters (Handout) Email Photo Print Photo