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's Turning More Than Half Its Streets into Pedestrian Zones. As the second most populous city in Spain, Barcelonaâs near 4.7 million person metro population makes it one of the largest cities in Europeâand thatâs not even including the 7.4 million tourists who come to the city each year.