Nice one overall so far great depth of knowledge I love this guy ... but do people points of the book make me think twice ... for example ...speaking about the future and people moving out of earth it mentions..Each space mission costs up to 800 million if you take the space shuttle program and decide it by missions... really!!! Maybe spaceX has a different story on that they where 10 million per mission
— Jul 31, 2018 10:59AM
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