Reasoning about the Manned Space Programhttps://www.billdietrich.me/ReasonMannedSpaceProgram.html
Overview Levels of exploration Observation (telescopes). "Space" (out of atmosphere; 100 km altitude). X-15 did this in 1963; commercial space companies have done this in 2011/201
My reasoning about the Manned Space Program and space exploration
That's everything I could find.
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