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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.，这一点在safew官方版本下载中也有详细论述
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"Instead of dismantling everything, we can actually reuse the facilities, the skills, the competencies we have."。业内人士推荐快连下载-Letsvpn下载作为进阶阅读
