Forty-seven astronauts and cosmonauts representing fifteen nations gathered September 15-19, 2008 in Seattle, Washington for the XXI Planetary Congress of the Association of Space Explorers. The theme of the XXI Congress was “Exploring Space – Inspiring Planetary Stewardship”, reflecting the Association’s belief that humanity’s continued expansion into space will ultimately result in greater awareness of, and care for, our home planet. The Congress was hosted by Seattle Museum of Flight president and former astronaut Bonnie Dunbar and underwritten by Title Sponsor Boeing Integrated Defense Systems. This poster commemorates the XXI Congress and bears the authentic signatures of forty-two of the participating astronauts and cosmonauts. This poster is part of a series of limited collector’s edition posters that have been produced and signed at each ASE Congress since the Association was founded in 1985. One hundred fifty-three posters were signed at the XXI Congress. The poster has two headings, the main heading in English at the top, with the Russian displayed at the bottom. Around the periphery are printed translations of “Association of Space Explorers” in the native languages of the Founding Members of the Association of Space Explorers. # in series: 153 Signature key included