There are 19 different possible solutions for the Astrodome.
GALVESTON, TX - SEPTEMBER 13: (AFP OUT) The roof of Reliant Stadium, home of the NFL's Houston Texans, is shown damaged by Hurricane Ike in this aerial view September 13, 2008 in Galveston, Texas. Ike caused extensive damage along the Texas Gold Coast, leaving millions without power. The Astrodome can be seen in the background. (Photo by David J. Phillip-Pool/Getty Images)