Indian Space Research Organisation
ISRO built India's first satellite, Aryabhata, which was launched by the Soviet Union on 19April 1975. It was named after the mathematician Aryabhata. In 1980, Rohini became the first satellite to be placed in orbit by an Indian-made launch vehicle, SLV-3. ISRO subsequently developed two other rockets: the Polar Satellite Launch Vehicle (PSLV) for launching satellites into polar orbits and the Geosynchronous Satellite Launch Vehicle (GSLV) for placing satellites into geostationary orbits. These rockets have launched numerous communications satellites and earth observation satellites. Satellite navigation systems like GAGAN and IRNSS have been deployed. In January 2014, ISRO used an indigenous cryogenic engine in a GSLV-D5 launch of the GSAT-14.
History of spaceflight
The Sputnik 1 became the first artificial Earth satellite on 4 October 1957. The satellite transmitted a radio signal, but had no sensors otherwise. Studying the Sputnik 1 allowed scientists to calculate the drag from the upper atmosphere by measuring position and speed of the satellite. Sputnik 1 broadcast for 21 days until its batteries depleted on 4 October 1957, and the satellite finally fell from orbit on 4 January 1958.