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Virgin Galactic's SpaceShipTwo Breaks Sound Barrier
2013-04-29 12:57:24

Virgin Galactic's SpaceShipTwo broke the sound barrier for the first time on Monday, reaching Mach 1.2 in a test flight.


Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.