Tag Archives: Astronomy Picture of the Day

The Northern Lights


Northern lights over Kulusuk, Greenland

Northern lights over Kulusuk, Greenland (Photo credit: Wikipedia)

The Northern Lights


The northern lights, or aurora borealis, are a luminous display of various forms and colors in the night sky of the Northern Hemisphere. They are caused by


Plasmasphere (Photo credit: Wikipedia)

high-speed electrons and protons from the Sun, which are trapped in the radiation belt above Earth and channeled toward the polar regions by Earth’s magnetic field. These electrically charged particles enter the atmosphere and collide with air molecules, exciting them to luminosity. Who coined the name “aurora borealis” for this phenomenon? More… Discuss