The ice suites do not have any bathroom facilities but bathrooms for guests are found in a warm building close by. There is also warm accommodation available next to the hotel. The Ice hotel in Jukkasjärvi is known to be the biggest hotel of ice and snow in the world, spanning over some 6,000 square meters (64,600 sq ft).[5] Each suite is unique and the architecture of the hotel is changed each year, as it is rebuilt from scratch. Each year, artists submit their ideas for suites, and a jury selects about 50 artists to create the church, Absolute Ice bar, reception, main hall and suites. When spring comes, everything melts away and returns to the Torne River. The Ice hotel only exists between December and April, and has been listed as one of the Seven Wonders of Sweden. The northern hemisphere's aurora borealis - a term coined by the 16th-century mathematician, Galileo Gallilei - can be seen during the winter month in the location. The dancing sheets of lights in the sky are caused by the earth’s magnetic field buckling as it is hit by high-velocity bursts of charged particles.