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2022 USPS SHEET OF 20 FIRST CLASS LETTER STAMPS. These images of the Sun come from NASA’s Solar Dynamics Observatory (SDO), a spacecraft launched in February 2010 to continuously monitor the Sun. The images shown are of the actual items. Shipped with tracking number. (3-5 days delivery). For other designs/ pictures, please check my other listings. This price is only for 1 set of “SUN SCIENCE” 20 stamps.