* Different definitions of "astronaut": Some consider anyone who has flown above the Karman line (100 km altitude) as an astronaut, while others only include those who have orbited Earth.
* Changing numbers: The number of astronauts is constantly increasing as space programs launch more missions.
However, here's a general idea:
* Over 570 individuals have traveled into space, according to the Astronaut Memorial Foundation.
* Over 600 individuals have traveled into space, according to NASA.
These numbers include astronauts from different countries, including the USA, Russia, China, Japan, and more.
To get the most up-to-date information, I recommend checking reputable sources like NASA or the Astronaut Memorial Foundation websites.
