Prime Minister Narendra Modi today revealed the name of four astronauts who have been selected for the Gaganyaan Mission. The astronauts are undergoing training for the country's maiden human space flight mission. The four astronauts are - Prashanth Nair, Angad Prathap, Ajit Krishnan, and Shubhanshu Shukla. The Gaganyaan Mission is India's first human space flight program for which extensive preparations are underway at various ISRO centres.