the sputnik built the first satellite to orbit earth.
the sputnik built the first satellite to orbit earth.
who built the first satellite to orbit earth?
the sputnik
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.
indian space research organisation
bullet::::- "quasi-satellites": quasi-satellites are co-orbital asteroids on a normal elliptic orbit with a higher eccentricity than earth's, which they travel in a way synchronised with earth's motion. since the asteroid orbits the sun slower than earth when further away and faster than earth when closer to the sun, when observed from earth, the quasi-satellite appears to orbit earth in a retrograde direction in one year, even though it is not bound gravitationally. by 2016, five asteroids were known to be a quasi-satellite of earth. is earth's closest quasi-satellite, in an orbit that has been stable for almost a century. orbit calculations until 2016 showed that all quasi-satellites and four of the horseshoe librators then known repeatedly transfer between horseshoe and quasi-satellite orbits. one of these objects, , was observed during its transition from a quasi-satellite orbit to a horseshoe orbit in 2006; it is expected to transfer back to a quasi-satellite orbit 60 years later.
near-earth object