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A long way to fall: Felix Baumgartner prepares to jump from 90,000ft during the first manned test flight for Red Bull Stratos over Roswell, New Mexico
The mystery surrounding the source of the highest-energy particles known in the Universe has grown deeper. The particles, known as cosmic rays, can show up with energies a million times higher than the biggest particle accelerators on Earth can produce.
Falling down: Baumgartner was expected to hit a speed of 690 mph before activating his parachute about 5,000 above the ground in southeastern New Mexico
BBC News - In pictures: 2012 as seen from space