Although winter in Greenland is long and dark, there is quite literally a bright side to it. The Northern Lights or Aurora Borealis is a natural phenomenon that occurs in the Northern Hemisphere when the sun's electrically charged particles enter the Earth's atmosphere creating a dancing, colourful light show.
The Northern Lights usually appear in green, purple, and yellow colours, but shades of red, blue, and pink have been reported too. The colour of the display depends on the gas particles that caused it. For example, shades of green are caused by oxygen molecules.