ISRO chief K Sivan offered prayers at Tirupati Balaji Temple on December 10. K Sivan visited the temple before the launch of PSLV C48 Mission on December 11. While speaking to media, K Sivan said PSLV C48 is a historic achievement for ISRO as this is the 50th launch of PSLV & 75th launch from Sriharikota.