Voyager 2 began it‘s journey away from Earth back in 1977 and is roughly 11 billion miles from home. In 2007 it entered the outermost layer of the heliosphere, and now based on data recorded by the probe‘s Cosmic Ray Subsystem instrument, NASA scientists say there‘s a good chance that it is about to reach the boundary (known as the heliopause) and join Voyager 1 in the history books as the second human-made object to go interstellar. Back in August, the cosmic rays hitting the probe increased by five percent.