The space shuttle fuel tank ET-94 is transported through Vermont Avenue in Los Angeles, the United States, on May 21, 2016. ET-94 is about 47 meters long and 8.382 meters in diameter. The transfer of the 29.48-ton space shuttle fuel tank from Marina del Rey to the California Science Center took about 18 hours. Photo: Xinhua

The space shuttle fuel tank ET-94 arrives at the California Science Center in Los Angeles, the United States, on May 21, 2016. ET-94 is about 47 meters long and 8.382 meters in diameter. The transfer of the 29.48-ton space shuttle fuel tank from Marina del Rey to the California Science Center took about 18 hours. Photo: Xinhua

Photo taken on May 21, 2016 shows a view of the roof of the space shuttle fuel tank ET-94 in Los Angeles, the United States. ET-94 is about 47 meters long and 8.382 meters in diameter. The transfer of the 29.48-ton space shuttle fuel tank from Marina del Rey to the California Science Center took about 18 hours. Photo: Xinhua

Photo taken on May 21, 2016 shows a view of the space shuttle fuel tank ET-94 in Los Angeles, the United States. ET-94 is about 47 meters long and 8.382 meters in diameter. The transfer of the 29.48-ton space shuttle fuel tank from Marina del Rey to the California Science Center took about 18 hours. Photo: Xinhua

The space shuttle fuel tank ET-94 is transported through Vermont Avenue in Los Angeles, the United States, on May 21, 2016. ET-94 is about 47 meters long and 8.382 meters in diameter. The transfer of the 29.48-ton space shuttle fuel tank from Marina del Rey to the California Science Center took about 18 hours. Photo: Xinhua