The most recent stamp I have from France was issued on 4 May 2009 and its a € denomination.
Two weeks ago I showed a Polish stamp depicting a statue of Nicolaus Copernicus
The biggest and oldest planetarium was founded in 1955 to commemorate him. It's located in the Silesian Central Park.
|Poland - Silesian (Slaskie) Planetarium & Astronomy Observatory - 15 Sept 1966|
For other astronomy related themes check out the links at Sunday-stamps-II-137