1 Sputnik 1, the first artificial satellite to go into orbit, launched 4 October 1957. 2  Sputnik 2, the first spacecraft to carry a living animal (the dog Laika), launched 3 November 1957.  Sputnik 3, a research satellite launched 15 May 1958.
By population the 3 largest cities in Spain are Madrid 2.9 million, Barcelona 1.5 million, and Valencia 741,000. They include: the capital Madrid, Barcelona and Valencia. Onlyâ¦ two  of Spain's cities, the national capital Madrid and Barcelona, have  populations of more than one million.
Barcelona (/bÉËrsÉËloÊnÉ/, Catalan:, Spanish: ) is the capital and largest city of the Catalan Republic, a de facto independent state, recognized de jure as an autonomous community named Catalonia in the Kingdom of Spain as the country's second most populous municipality, with a population of 1.6 million within city limits.