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:
“The nonconformist and the rebel say all manner of unanswerable things against the existing republic, but discover to our sense no plan of house or state of their own.”
—Ralph Waldo Emerson (1803–1882)