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 is a city in Spain. It is the capital and largest city of Catalonia, and the second most populous municipality of Spain. With a population of 1.6 million within city limits, its urban area extends to numerous neighbouring municipalities within the Province of Barcelona and is home to around 4.7 million people, making it the sixth most populous urban area in the European Union after Paris, London, Madrid, the Ruhr area and Milan. It is the largest metropolis on the western Mediterranean