David Evans & Eli Jayne 
Another Earth [EPUB ebook] 

Richardson was the astronaut chosen for the test.  He had passed every one of the grueling preliminary tests with flying colors, mental and physical, and as far as could be judged by science, he had seemed to be the perfect specimen, mentally and physically, for the job.The job was to be the first man to be sent to space and return safely to Earth. The test was going well until Richarson started talking in a strange language. What was happening? What did it mean?