0 the sun and the group of planets that move around it --
1 the sun and the group of planets that move around it, or a similar system somewhere else in the universe --
They brought us the first pictures of Saturn and Neptune and are now reaching the limits of the solar system.
Launched within weeks of each other in 1977, each Voyager has been traveling in a different direction through the solar system at approximately 500 million kilometers per year.
Beyond the limits of the solar system, we can only watch from a distance.
