[8] The launch came from an agreement between India and the Soviet Union directed by UR Rao and signed in 1972.

[6][3] It was built to conduct experiments in X-ray astronomy, aeronomics, and solar physics.

All faces (except the top and bottom) were covered with solar cells.

[1] Spacecraft mainframe remained active till March 1981.

[3] the satellite entered Earth's atmosphere on 10 February 1992 due to orbital decay.