No Lunar Colonies? No Pan Am Rocketplanes? No S***

Over at The Space Review this week, there are some interesting pieces on why, 50 years after NASA was created, there are no colonies at the moon, Mars or L-5. In addition to Nader Elhefnawy’s essay on overpopulation and space exploration (see separate post, below), there are three other articles loosely grouped around this common theme.