One of most spectacular sights that nature has blessed us with is the play of lights in the northern skies called the aurora borealis near the Arctic and the Antarctic regions of the earth. Aurora, the word basically takes after the Roman goddess of dawn and just like dawn is brings in a play of colors, so does the Aurora.
But in reality, it is actually when the charged particles from the sun that are dragged into the atmosphere by the Earth's magnetic field collide with the atoms of nitrogen and oxygen in the atmosphere, these lights colored lights are created.
And the color of the Northern Lights actually depends on the type of atom that is involved in the collision. While red lights occur at the altitude of 150 miles and above, green lights are always seen to occur at the altitude of upto 100 miles.