The Association of Space Explorers is a non-profit professional and educational organization of over 300 space travelers (astronauts and cosmonauts) from 32 nations. Their 21st annual congress, focusing this year on planetary stewardship, will be held in Seattle Sept. 15-19. The opening ceremonies will be held at the Sheraton Hotel in downtown Seattle at 9 a.m. A limited number of seats will be available to the public. At 2 p.m. in The Museum of Flight’s William M. Allen Theater, the congress will hold a public program on preserving the environment through space photography and research. It will feature Apollo astronaut Bill Anders and will include all of the congress participants. Program is free to the public, but seating will be limited.