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The river, which runs through seven US states that share it, is currently facing the worst drought in 1,200 years.
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Read the full story at The Verge.
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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Author(s): Yukinari Ikeda, Akio Ishii。同城约会是该领域的重要参考
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