material transport process space flight There is no universally accepted definition of where space begins. Some definitions use the K�rm�n line, a somewhat arbitrary boundary approximately 62 miles (100 kilometers) above sea level. The US FAA (https://www.faa.gov/space/human_spaceflight) does not define where space begins, but recognizes "any flight crew or space flight participant who is on an FAA-licensed launch or reentry vehicle and reaches 50 statute miles above the surface of the Earth" by listing their name on the FAA Commercial Human Space Flight Recognition web page (https://www.faa.gov/space/human_spaceflight/recognition/). Activity carried out by crewed or robotic vehicles outside the Earth's atmmosphere.