By the 1980s, the museum's permanent displays included a dinosaur exhibit, a space museum, and exhibits on geology, biology, petroleum science, technology, and geography. In 1988, the Challenger Learning Center was opened in memory of the Space Shuttle "Challenger" crewmembers that were lost during the shuttle's tenth mission. The center's aim is to teach visitors about space exploration. The Wortham IMAX Theatre and the offsite George Observatory were opened in 1989.