Who is the author of XXX?
Space Cadet
Both the ``trainee astronaut'' and ``person regarded as being out of touch with reality'' entered the Oxford Dictionary for English language, though by 2014 Oxford notes that in American English, the phrase had also recouped the positive connotations originally meant by Heinlein and Joseph Greene, the Tom Corbett, Space Cadet writer: ``An enthusiast for space travel, typically a young person.''