The picture, known as Pale Blue Dot (above) depicts our
planet as a nearly indiscernible speck roughly the size
of a pixel. 

On Valentine’s Day, 1990, 3.7 billion miles away from the sun,  
the Voyager 1 spacecraft looked back at our solar system and
snapped the first-ever pictures of the planets from its perch at
that time beyond Neptune. This is the last image Voyager 1 ever
beamed back after which the cameras were turned off to save
power and memory.

Artist impression of Voyager-1.