The glory days of NASA, of space shuttles and sending people to the moon, are at an end. With our astronauts currently relying on hitching rides from the Russians to get to the International Space Station, NASA has turned its attention to more modest projects.

Michael Kozlowski writes for GoodeReader that the agency has recently been working on an e-book program to offer titles that would be of interest to space enthusiasts, about aeronautics, technology, outer space research, and more. Some of the available books, for example, are Crash Course: Lessons Learned from Accidents Involving Remotely Piloted and Autonomous Aircraft, Earth As Art, and Cosmos and Culture: Cultural Evolution in a Cosmic Context.

NASA E-Books is a relatively new initiative, with titles ranging from 2009-2014, all of which are available for free from its website in PDF, EPUB, and MOBI formats. It doesn’t distribute its titles to any other platforms, like Amazon or Kobo — so if you have a hankering for a book called When Biospheres Collide, you will have to head to NASA’s website to download it directly.

It’s not quite the “empire” that Kozlowski describes, nor is it as exciting as the heyday of shooting people all around the known universe, but if NASA is making a serious move into digital publishing, it certainly has found the appropriate titles for its audience of outer space enthusiasts.