is an artificial object which has been intentionally placed into
launched the world's first artificial satellite,
Since then, about 6,600 satellites from more than 40 countries have been
According to a 2013 estimate, 3,600 remained in orbit.
Of those, about 1,000 were operational;
while the rest have lived out their useful lives and become
500 operational satellites are in
50 are in
(at 20,000 km), and the rest are in
(at 36,000 km).
A few large satellites have been launched in parts and assembled in orbit.
Over a dozen
have been placed into orbit around other bodies and become artificial satellites