My name is Dexter. I heard that you are sending two people to Mars and I would like to come but I'm seven and a half and I can't. I would like to come in the future, what do I need to do to come an astronaut.
Thank you, Dexter
And proving that NASA is the best, they wrote him back!
And included a ton of cool space swag.
Along with some photos of Mars.
And a very cool picture of the Curiosity Rover.
And even more adorably, according to a NASA employee on Reddit, Dexter's letters are pinned up in cubicles around the office!