“We tend to think of America's days of frontier exploration as being behind us, but that's because we tend not to think of the other 71% of our blue planet.” ThinkingAmericaBehindsPlanetsBlueExplorationFrontiersBlue Planet Author:David Helvarg
“After Apollo 17, America stopped looking towards the next horizon. The United States had become a space-faring nation, but threw it away. We have sacrificed space exploration for space exploitation, which is interesting but scarcely visionary.” StatesAmericaNextNationsSpaceInterestingUnitedUnited StatesExplorationHorizonExploitationApolloVisionariesSpace Exploration Author:Gene Cernan