Les Johnson, Baen author and space scientist discusses his free nonfiction article "Mars, Moon or Bust!" on the Baen.com web site and in the ebook Free Nonfiction 2016 at Baen Ebooks. Johnson issues a call for space advocates to stop bickering and unify, and he provides an excellent survey of the advantages, disadvantages, and trade-offs of various ideas for getting humans out of low Earth orbit and back into space exploration and development; also part 46 of the complete audiobook serialization of John Ringo's Under a Graveyard Sky.
The Baen Free Radio Hour