(Peace and Progress!)
The back is written in Russian and in English. The English words are:
In the Name of Peace and Progress!
The sender writes that Voskhod 2 was a Soviet manned space mission March (18th-19th) 1965. It established another milestone in space exploration when Alexey Leonov became the first person to leave the spacecraft in a specialized spacesuit to conduct a 12 minute 'Spacewalk'.
This is a reproduction postcard that is postmarked in 2015.