A very long filament (seen as a dark line) stretches from a bright spot on the Sun's right limb, spanning almost the entire width of the Sun, nearly one million miles. That is about four times the distance from the Earth to the Moon. Filaments are twisting masses of cooler ('only' 10,000 - 100,000 degrees Kelvin) gas contained by magnetic fields above the Sun's surface in the midst of the much hotter (~ 1,500,000 K) corona. The Extreme ultraviolet Imaging Telescope (EIT) 195 Angstrom instrument