| All returns accepted | Returns Accepted |
|---|---|
| Refund will be given as | Money Back |
| Item must be returned within | 14 Days |
| Return shipping will be paid by | Buyer |
| Restocking Fee | No |
Check the listing for details. Yemen Space Exploration History Pioneer Program Block 1969. Listed at 2.99 USD. Very nice stamps. The Pioneer program is a series of United States unmanned space missions that were designed for planetary exploration. There were a number of such missions in the program, but the most notable were Pioneer 10 and Pioneer 11, which explored the outer planets and left the solar system. Pioneer 10 and Pioneer 11 carry a golden plaque, depicting a man and a woman and information about the origin and the creators of the probes, should any extraterrestrials find them someday.