Emily Lakdawalla at The Planetary Society:
Sunday, August 20 marks the 40th anniversary of the launch of Voyager 2. Tuesday, September 5, will be the 40th anniversary for Voyager 1. Round anniversaries like these have no special significance for spacecraft that have departed Earth’s orbit; the significance is for those of us that the spaceships left behind on a planet that still revolves around the Sun once a year.
The Voyager program is nuts. For a nice recap, check out episode 44 of Liftoff.