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Space Age
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==Periodization== The periodization of the Space Age can differ substantially, with some differentiating between a ''first'' Space Age and a ''second'' Space Age, which are separated at the turn of the 1980s/1990s.<ref name="v197">{{cite report | last1=Harrison | first1=Todd | last2=Cooper | first2=Zack | last3=Johnson | first3=Kaitlyn | last4=Roberts | first4=Thomas G | title=Escalation & Deterrence in the Second Space Age | date=2017 | publisher=Unpublished | doi=10.13140/RG.2.2.15240.11525 | url=http://rgdoi.net/10.13140/RG.2.2.15240.11525 | access-date=14 October 2024 | page=}}</ref>
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