Voyager Turns 30

This fall is the 30th anniversary of the Voyager missions to the outer planets and beyond. The missions brought back the first close-up images of Jupiter, Saturn, Uranus, and Neptune along with a plethora of new discoveries about the planets and their moons. Before these missions no one knew that there were volcanoes on any other celestial body other than Earth. Jupiter’s moon Io turned out to be THE place in the solar system for the ultimate in volcanism. From fire to ice, Neptune’s moon Triton, the coldest body in the solar system, was discovered to have geysers that spewed nitrogen gas and dust high into it’s atmosphere. I grew up in the Voyager age and can remember learning about the planets from the very pictures that the spacecraft sent back to Earth. We’ve learned so much since Voyager 1 and 2 passed through our outer Solar System, and we have such a better understanding of these planets and their moons because of these two missions. When Voyager 1 passed the orbits of Neptune and Pluto, NASA turned around the craft and took a picture of our tiny Earth, which looked like nothing more than a small blue speck against a black backdrop. NASA also took pictures of the rest of the planets and made a family portrait of our solar system family. Those spacecraft are still transmitting data, 30 years and about 9 billion miles later. Scientists think the craft are approaching the boundary of the heliopause, where the solar wind and interstellar wind meet. In about 80,000 years they will reach Alpha Centauri, our closest star at around 4 light years away. In billions of years when the Sun is nothing more than a cinder, these two spacecraft will still be on their journey through our galaxy, carrying with them a piece of humankind and human spirit.