Boeing and SpaceX, who have been struggling to meet safety thresholds established by NASA for commercial crew vehicles, now believe their vehicles can meet those requirements as they prepare for test flights scheduled in the next several months.
from Space.com https://ift.tt/2Dpvs7H
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By BY RAYMOND ZHONG from NYT Technology https://ift.tt/2ZVzHzt
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By BY NATHANIEL POPPER from NYT Technology https://ift.tt/31OxrNi
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The blood-red color of the moon during a total lunar eclipse may be difficult to explain without a basic understanding of orbital mechanics,...
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