Spacecraft
Helios 2 Solar Probe: The Helios 2 Solar Probe, a NASA and German Aerospace Center (DLR) mission, holds the record for the fastest speed relative to the Sun. It reached a heliocentric speed of about 157,078 miles per hour (252,792 kilometers per hour) on April 17, 1976.
Aircraft
The X-15 rocket-powered aircraft, operated by NASA and the U.S. Air Force, holds the official world record
