It was not immediately clear what caused the crash, but some witnesses said the weather at the time was treacherous.
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Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.，详情可参考Line官方版本下载
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