Jan 6, 2015
The Challenge of the Planets, Part One
The Challenge of the Planets, Part One
In the 1950s and early 1960s, many who made it their business to consider the yawning gulfs between the planets foresaw that only through enormous efforts, spanning perhaps centuries, could those immensities be crossed. To be sure, rocket engines burning chemical propellants akin to those already in use in missiles could accomplish round-trip journeys to […]
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