The term 'Northern Sky Sight' can be summarized by the crossword solution 'Aurora, ' which is a natural light display in the sky, particularly in the high latitude regions of the Northern Hemisphere. Aurora is caused by the collision of energetic charged particles with atoms in the high altitude atmosphere. The particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth's magnetic field into the atmosphere. The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity.