The Aurora Borealis, also known as the Northern Lights, is a natural light display in the Earth's sky, predominantly seen in the high-latitude regions of the Arctic and Antarctic. The lights are caused by the collision of charged particles with atoms in the Earth's atmosphere. The color of the aurora is determined by the type of gas particles that are colliding. The most common color is a pale yellowish-green, but the aurora can also appear red, yellow, green, blue, or purple. The aurora is typically visible during the night and can be seen in many areas, including Alaska, Canada, Northern Europe, and Russia.