In 1977, two unmanned spacecraft were launched by NASA to visit the farthest planets of the solar system. At the end of 2012, they journeyed out into the galaxy beyond the sun, carrying a message from Earth.
In 1977, two unmanned spacecraft were launched by NASA to visit the farthest planets of the solar system. At the end of 2012, they journeyed out into the galaxy beyond the sun, carrying a message from Earth.
