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At a young age it's encouraged that you let your imagination run away a bit.
Because of that we all have dreams of particular careers, ones that seem really cool as a kid. For example, we've all probably had visions of being an astronaut.
The cool suit, controlling a rocket, floating around space - it's everything a nine-year-old wants.
Jack Davis, who is nine, very much wanted his dream to become reality and so he sent a letter to NASA applying to work for the agency.
NASA listed the role of planetary protection officer, which aims to protect Earth, stopping contamination from "extraterrestrial targets of exploration".
"My name is Jack Davis and I would like to apply for the planetary protection officer job," Jack said in a hand-written application. "I may be nine but think I would be fit for the job.
"One of the reasons is my sister says I am an alien also I have seen almost all the space and alien movies I can see.
"I have also seen the show Marvel Agents of Shield and hope to see the movie Men in Black.
"I am great at video games.
"I am young, so I can learn to think like an Alien.
"Guardian of the Galaxy
Though surely what young Jack didn't expect was a reply from NASA, but that's exactly what he got.
He received a very encouraging letter from Dr James L Green, the director of NASA's planetary science division, as well as a phone call from NASA's planetary research director, Jonathan Rall, congratulating him on his interest in the role, Sky News reports.
The letter read: "Dear Jack,
"I hear you are a 'Guardian of the Galaxy' and that you're interested in being a NASA Planetary Protection Officer. That's great!
"Our Planetary Protection Officer position is really cool and is very important work. It's about protecting Earth from tiny microbes when we bring back samples from the Moon, asteroids and Mars. It's also about protecting other planets and moons from our germs as we responsibly explore the Solar System.
"We are always looking for bright future scientists and engineers to help us, so I hope you will study hard and do well in school. We hope to see you here at NASA one of these days!
"Dr. James L. Green
"Director, Planetary Science Division."
Jack certainly has a big future ahead of him. I personally think NASA should set up a young person's apprentice scheme, just for the nine-year-old.
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