Man made satellites can fly 8000 meters a second. NASA's new horizons has a speed of 16.7 km / s. Artificial satellite is an unmanned spacecraft orbiting the earth in space orbit. Artificial satellites can be divided into three categories: scientific satellites, technical test satellites and application satellites. Artificial satellite is the spacecraft with the largest number of launches, the widest range of uses and the fastest development. Artificial satellites are generally composed of special systems and support systems. Special systems refer to systems directly related to the tasks performed by satellites, also known as payloads.
The motion orbit of man-made satellite depends on the mission requirements of the satellite. It is divided into low orbit, medium high orbit, geosynchronous orbit, geostationary orbit, solar synchronous orbit, large elliptical orbit and polar orbit.
Man made satellites fly around the earth at a fast speed. Low orbit and medium high orbit satellites can fly around the earth several to more than ten times a day, regardless of territorial, airspace and geographical conditions. （RenZaoWeiXingYiMiaoNengFei8000MiMa）