Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4939.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4939. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Space Missions, Solar System Missions
Scientific paper
A man-made object placed in orbit round the Earth or some other celestial body. The first artificial Earth satellite was Sputnik 1, launched by the then Soviet Union, on 4 October 1957. Spherical in shape, and with a mass of 84 kg, it entered an orbit with a perigee altitude of 229 km, an apogee altitude of 947 km and a period of 96 min. Artificial satellites are used for a wide variety of roles,...
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