I used Photoshop and several tutorials. The planet was made from different country textures I found online and edited them together and used the clone tool to make it look more like continents. Then I made it a sphere and added shadow and atmosphere effects. The nebulas and galaxy took the longest to make. You can find some great tutorials out there to do pretty much anything, that's for sure.

Thanks! I think it's pretty good for my second attempt. Not going to post my first attempt, since it was just the learning phase. It didn't turn out that good. 

Thanks! I need to try and make some more stuff when I get a chance.

Well done sir!