Images Dated 13th February 2007

Explorer 1 in orbit

Explorer 1. Computer artwork of America's first successful artificial satellite, Explorer 1, in orbit. Explorer 1 was launched on 31 January 1958, after the USSR took the USA by surprise by launching the world's first artificial satellite, Sputnik 1, on 4 October 1957. The satellite measured 2.05 metres in length and weighed 14 kilograms. It orbited Earth at heights of between 360 kilometres and 2520 kilometres until 31 March 1970. It carried, amongst other instruments, a geiger counter, used to detect cosmic rays. Data collected by the satellite led to the discovery of the Van Allen radiation belt, a torus of charged particles held in place by the Earth's magnetic field

© DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY

Wandering albatrosses, Drake Passage;

Wandering albatrosses (Diomedea exulans) adult birds with the largest wing span, flying together above ocean while using wind and air currents, clear summer sky, Antarctic Convergence; Drake Passage; Antarctica; Southern Ocean

© John Eastcott and Yva Momatiuk

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A military working dog sits on a U.S. Army M2A3 Bradley Fighting Vehicle

February 13, 2007 - U.S. Air Force military working dog sits on a U.S. Army M2A3 Bradley Fighting Vehicle before heading out on a mission in Kahn Bani Sahd, Iraq

© Stocktrek Images

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