Indian Space Research Organization, ISRO today said it plans to launch at least two large communication satellites within this calendar year to tide over the scarcity of transponders. The space agency has also decided to turn to the tried and tested Arianespace for the twin launches scheduled for March and December this year. The move comes after the failure of two consecutive GSLV missions. Director of the ISRO Satellite Centre, T K Alex told reporters on the sidelines of the 98th Indian Science Congress in Chennai that the space agency has also been hiring transponders on other satellites as a temporary solution to clear the backlog. Mr. Alex said ISRO is also helping universities develop smaller satellites, nano satellites, which also could be used to demonstrate nascent technologies.