Probes & Missions in Space

Sputnik 1: The Space Race Begins Here 
(स्पुतनिक 1:दुनिया का पहला कृत्रिम उपग्रह)

http://discoverysciencenews.blogspot.in/p/sputnik1.htmlThe Soviet Union successfully launched Sputnik 1, the world's first artificial satellite, on October 4, 1957, surprising the world and starting the space race. The 183-pound (83-kilogram) spacecraft whipped around the Earth every 98 minutes, transmitting a series of beeps. Sputnik means "companion" in Russian................................Visit Page.

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