Fastest man made thing ever

Answer 1

Helios that reached 150,000 mph. The Helios, which holds the record for fastest man made object, was a series of two spacecraft launched in the mid-1970s to study the Sun. Both probes were developed through cooperation between the US and West Germany with scientists from both nations providing experiments and NASA providing the launch vehicle and booster. Helios 1 was launched in December 1974 and Helios 2 in January 1976, both reaching the Sun within about three months.