During trials in Australia’s outback, an air-breathing supersonic combustion jet engine has been successfully tested at 10 times the speed of sound!
It’s a scramjet engine that takes the control after high speed is reached by a rocket.
Here is a good example for your to imagine how fast is Mach 10 (3,402.9 m/s):
The Earth is around 40,000 km in circumference so at this speed, it would take less than 4 hours for a full journey around the world.
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