Astronomers, or scientists who study stars and everything in outer space.
Yes, there are telescopes aboard many satellites that perform astronomical observations.
Satellites don't visit anything, they orbit astronomical masses.
There are several uses of satellites which depends on the particular type. In most cases, they are used for space exploration, communication of signals, navigation and astronomical ventures among others.
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Asteroids and Comets.
A GPS uses satallites to identify location
It uses 66 small satellites in low earth orbit
the iPhone uses cell towers for all communication and satellites to receive the GPS signals so, both. The iPhone does not connect to satellites. It uses cell tower triangulation.GPS does not mean satellite.
hughes.net uses their own satellites
fact
what are artificial satellites, its uses and significances
Satellites are launched into space for a specific job. Most commonly satellites are used to support communication, such as TV and provide source for phone cells.