• On the 17th of April, 1976, space craft [Helios] 2 set the record for the [fastest man-made object] at approximately 150,000mph; [241],350 km/h; 203.25 times the speed of sound at -3 degrees Celsius (see Mach); or about 1/4470th the speed of light.


    Fastest man-made object meaning & definition 1 of Fastest man-made object.

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