When the Voyager spacecraft left our planetary system on its mission into the endless depths of space, Arthur C Clark had the vision and determination to convince NASA to risk turning the camera back to earth for a last farewell picture. 

Here is a snippet of the end of that 1994 lecture. It starts with "I only have two slides":

 

 Voyager 1 and 2 was launched in 1977 and are still active reporting daily home after more that 42 years in operation.

More information for the curios at https://voyager.jpl.nasa.gov/mission/status/

 

Joomla templates by a4joomla