Some of the glorified careers we hear about as kids include firefighters who save lives, doctors who cure illnesses, and astronauts who venture into space.
If you grew up in the US, then NASA's astronaut program is the one with which you're probably most familiar, but just how much do you know about the selection process?
Between 4,000 and 8,000 people apply during each round of NASA applications, but only eight to 35 are selected. And the next round is opening soon.
Do you have what it takes to be a NASA astronaut? Take this quick quiz to see what you know.