As of 2021, over 570 people from more than 40 countries have traveled to space. This includes astronauts, cosmonauts, and other space travelers who have flown on various space missions, including those to low Earth orbit, the Moon, and beyond. The exact number can be difficult to determine because different organizations and countries may use different criteria for defining who qualifies as an "astronaut" or "space traveler." However, the number is constantly changing as new people are sent to space with each new mission.