Would you say, you know a lot about space and our solar system? Well I suggest you put your money where your clicking finger is and go through the quick questioner.
DOF or Depth Of Field is a commonly used technique in photography where you can precisely focus only part of the face or object you are taking shot of. Let's recreate this using Photoshop.
If you don't want others to use your photos and images without your permission, you can create a so called custom watermark with your name or any other text you want.