European Space Agency
European Space Agency: Esa Kids: Our Universe: Satellites
A basic introduction to artificial, or man-made, satellites. Links to information about the planets and other objects in our solar system are included.
University of Wisconsin
The Why Files: Sputnik's Legacy
Easy-to-read history of the Soviet satellite launch that began the race for space between the Soviet Union and United States. Click on "next" at the bottom to advance to the next page.
Siteseen
Siteseen: American Historama: Sputnik
Detailed information on Sputnik, the first artificial satellite to orbit Earth, launched by the USSR on October 4, 1957.