Country: Sri Lanka
Date of Issue: 5th December 2014 (no. 858)
Top row, from left to right:
Bottom row, from left to right:
If you grew up with 9 planets in the solar system, you might remember that in 2006 Pluto failed to meet all the new requirements for a planet, and was reclassified a dwarf planet. So now we only have 8 planets in the solar system.
Thanks to Stamp Wench for this souvenir sheet.