An aurora (plural: auroras or aurorae) is a natural light display in the sky, particularly in the polar regions, caused by the collision of charged particles directed by the Earth's magnetic field. An aurora is usually observed at night and typically occurs in the ionosphere. It is also referred to as a polar aurora or, collectively, as polar lights. These phenomena are commonly visible between 65 and 72 degrees north and south latitudes, which place them in a ring just within the Arctic and Antarctic polar circles

Polar Lights

Tips on choosing wallpaper, the factor of choice - Topic:
For the people of original and creative is very important subjects of images. This setting your wallpaper can play a very important role, because a picture is installed on the desktop, will be in front of your eyes during the whole of your use of the computer. Images of different subjects have different effects on your mood: it may cause a smile or sad, invigorate or relax, distract, or, conversely, help to concentrate. In addition, your chosen theme will emphasize your best interests and helps you to express your mood. Of course, on this nuance is very difficult to give any advice, it's purely an individual matter, but would like to mention points that you should pay attention. It is necessary to take into account your interests, hobbies, but do not forget about the others, when it comes to your office computer. Also, think about what effect you want from the selected background.