Amazing aurora borealis
One of nature's most spectacular phenomena is the aurora borealis, colloquially referred to as the northern lights. Caused by geomagnetic storms in the outer sections of the Earth's atmosphere, these amazing light shows are most visible in the autumn and winter when the Northern Hemisphere's nights are at their longest. Many people would not even be aware of these nature-made fireworks if not for the pictures sometimes published on the internet and in glossy magazines like National Geographic. These photographs are usually taken north of the Arctic Circle, where the northern lights are at their brightest.
Depending on conditions and visibility (not to mention where the sun is in an 11-year cycle), the aurora borealis can be seen as far south as the northern contiguous United States. Sightings are not guaranteed, however, and even aurora-seekers in places like Maine and Michigan's Upper Peninsula can go a year or longer without seeing the even faintest glow in the northern sky. Around the world, other hot spots like northern Scandinavia and Greenland draw serious aurora-seekers because of their consistently clear skies and the brightness of the lights.