What is the fastest speed achieved by a man-made object?
The fastest speed achieved by a man-made object is 252,792 Km/H or 157,078 MPH.
It was achieved by a Solar Probe (Helios 2) launched into space on Jan. 15, 1976. The Maximum speed was achieved on 17 of April 1976 with a perihelion distance of 0.29 AU. Helios 2 has a wildly elliptical orbit, so the speed at its farthest distance was only 72,985 km/h at 0.983 AU.