Sincerely, Jack Davis Guardian of the Galaxy Fourth Grade” While NASA could have easily with laugh, planetary science director Jim Green decidec to write and sign a thoughtful letter back to Davis. In the letter that congratulated him on his interest in the position, to work hard at school, and added that he hoped around NASA in the future. He said “At NASA, we love to teach kids about space and inspire them to be the next generation of explorers. Hopefully, with patience, Jack will be amoung those Explorers too.”