Voyager 1 truly has gone where no man (or spacecraft) has gone before. Huge changes in the environment around the space probe indicate that it has gone beyond the heliosphere, our little corner of space that's dominated by the influence of the sun.
It only took 35 years for the craft to travel more than 11 billion miles from the sun and possibly exit the solar system. What scientists are seeing is a huge spike in galactic cosmic rays.
"Within just a few days, the heliospheric intensity of trapped radiation decreased, and the cosmic ray intensity went up as you would expect if it exited the heliosphere," said Bill Webber, professor emeritus of astronomy at New Mexico State University in Las Cruces.… Read more