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.
Madrid [1] is the capital and largest city of Spain, as well as the capital of the autonomous community of the same name (Comunidad de Madrid). The population of the city is roughly 3.3 million with a metro area population of almost 6.5 million. Madrid is best known for its great cultural and artistic heritage, a good example of which is the El Prado museum. Madrid also boasts some of the liveliest nightlife in the world.