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.
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This Tweet is currently unavailable. It might be loading or has been removed.。业内人士推荐WPS官方版本下载作为进阶阅读
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