The Bremerhaven postmark on this pre-stamped International Polar Year envelope from Germany commemorates the MOSAiC Expedition. This was a one year expedition that turned the RV Polarstern into a drifting Arctic observatory to study effects of climate change. It involved several countries and hundreds of researchers, making it the largest Arctic expedition in history.
Postmark commemorating the launch of NASA's latest Mars mission. Launched on 30 July at 11:50 UTC, the Perseverance rover and an autonomous helicopter drone called Ingenuity are scheduled to land on Mars on February 18th, 2021.
Annual semi-postal stamp from Canada. The additional 10 cents added to the purchase price of each stamp goes to non-profit organizations that help children in need.
