Which NASA mission, launched in 1977, was intended to explore the outer planets of the solar system and eventually left the heliosphere to enter interstellar space?

Voyager 1

Voyager 1, launched by NASA in 1977, is one of humanity's most audacious achievements in space exploration. Originally intended to study Jupiter and Saturn, it provided valuable data and images of these gas giants and their moons. After completing its primary mission, Voyager 1 continued its journey out of the solar system, entering interstellar space in 2012, making it the first human-made object to reach this space. It continues to transmit data, providing us invaluable information about the unexplored regions of our galaxy.