A 35-minute flight from London to New York is a step closer to reality following the latest successful test of hypersonic technology.
A joint US-Australian military research team sent a scramjet attached to a rocket booster to an altitude of 172 miles (278km) at Mach 7.5 - or seven times the speed of sound.
Today's test is one of 10 trials of the technology being run at the world's largest land testing range, Woomera in South Australia, and at Norway's Andoya Rocket Range.
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