An unmanned experimental jet broke a world record for speed on Tuesday, cruising over the Pacific Ocean at just under 7,000 miles per hour in a NASA test of cutting-edge “scramjet” engine technology.

The X-43A aircraft flew at a speed of around Mach 9.6 — nearly ten times the speed of sound — after a booster rocket took it to around 110,000 feet and then separated.



A modified B-52 airplane had carried the experimental plane and booster aloft.



It was the last of three test launches for the X-43A series and its supersonic-combustion ramjet or “scramjet” engine. The scramjet scoops up oxygen from the air rather than carrying liquid oxygen in a tank like an ordinary rocket.



Scramjet technology, NASA has said, could open the way to cheaper, safer and faster flights into the upper atmosphere, with smaller and lighter craft.



“I think it’s easier than people think it is. We can really do this stuff. I don’t mean to make it sound too easy, but it’s definitely doable,” said Randy Voland, a senior research engineer on the project, at a news conference after the test.



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