Existing Interstellar Probes
Five spacecraft (three active spacecraft) are currently on interstellar trajectories, unless they hit something after they stop communicating.
Read more about this topic: Interstellar Probe
Famous quotes containing the word existing:
“For the existing world is not a dream, and cannot with impunity be treated as a dream; neither is it a disease; but it is the ground on which you stand, it is the mother of whom you were born.”
—Ralph Waldo Emerson (1803–1882)