Answer:
The Planets
Explanation:
For example, Voyager 1 and 2 were launched in 1977 and in 1989 Voyager 2 passes Neptune and in 2012 after 35 years of it's journey Voyager 1 became the first spacecraft that reached the edge of the solar system.
Another example is the New Horizon spacecraft which was launched in 2006 and in 2015 it becomes the first spacecraft to fly by Pluto. So in current world scenario spacecrafts from earth only traveled between the distance of Planets.
