The Aurora borealis, or northern lights, are produced when energetic particles collide with atoms and molecules in the Earth's atmosphere. The Earth is constantly bombarded by these charged particles from the Sun. They travel through space at tremendous speeds and can impact the Earth's magnetic field. When these particles collide with the gases in the atmosphere, they excite them, causing them to glow and emit light.

The strength of the aurora depends on the number of charged particles impacting the atmosphere and the direction of the magnetic field lines. The aurora is typically strongest at high latitudes, closer to the Earth's magnetic poles, where the magnetic field lines are strongest. The color of the aurora depends on the type of gas that is excited. Oxygen produces green and red auroras, while nitrogen produces blue and purple auroras.

The aurora is a beautiful sight and a reminder of the constant activity of the Sun and the Earth's magnetic field.