Not sure if everyone is aware of these National Geographic links, so I am posting them here.
This link is Your Shot. A location on NatGeo's website where you can post a pic once a month and it could be selected for publication in their monthly magazine.
This link is My Shot. A location where you may create your own gallery of photos. (This is the place where I initially posted my Orion Nebula photo which NatGeo selected for sale)