As NASA prepares to announce the astronauts who will fly the first commercial crew missions, an independent safety board is cautioning that it is still too soon to set dates for those flights.
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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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