The Aurora Borealis, or Northern Lights, is not invisible but the
phenomena causing it is. When the sun is burning, it’s not only
sending sunlight towards earth but also clouds of charged particles -
so-called “Solar Winds”. What protects us is the earth’s magnetic
field - the same field that makes the compass arrow point north. The
magnetic field deflects most of the dangerous particles. However, some
of them sneak through at the points where the magnetic field starts
and ends – earth’s north and south poles. When the solar wind
particles reach Earth, they collide with gasses in the atmosphere and
small bursts of light are created. Millions of these light bursts make
up the Northern lights.