Secretive drone will test materials for future spacecraft
 

While the Boeing-built X37B drone's nature remains mysterious, we at least know that it's a test-bed for futuristic space tech. When it launches on May 20th, it won't only be testing a new type of Hall effect thruster for the Air Force, it will also ...

http://www.engadget.com/2015/05/06/s...=rss_truncated