Outer Edges
Voyager 1 and 2 had both crossed the outer edges of the heliosphere and entered interstellar space. However, reaching this region of the galaxy was never the main objective of these crafts. The probes had been sent into space for other reasons.
NASA’s Voyager Program
The probes were sent into space as part of NASA’s Voyager program. Voyager 1 and Voyager 2 were launched into the skies in 1977. Both of these probes were sent into space to explore our solar system’s outer reaches.