Chennai, Jan 4 (Reporter) Dr. V. Narayanan, Distinguished Scientist (Apex Grade), has assumed charge of Secretary, Department of Space, Chairman, Space Commission and Chairman, ISRO, on Tuesday. This marks a key leadership transition for India's space program, ISRO posted in X. With nearly four decades at ISRO, his leadership is set to guide India's ambitious space missions. He succeeds Dr.Somanath, who had a fruitful and successful tenure. (ED : PICK UP SUITABLY FROM EARLIER SERIES)...////...