Page last updated at 10:53 GMT, Monday, 20 October 2008 11:53 UK

Nasa launches Ibex probe

US space agency Nasa has launched the interstellar boundary explorer, or Ibex, which will explore the edges of the solar system.

The probe was launched aboard a Pegasus rocket, which was dropped from a jet 12,000 metres (40,000 ft) over the Pacific Ocean.

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