A hot wire will ignite a sheet of cotton and fiberglass 1.3 feet wide and 3.2 feet long. The fire is contained in a special box that will prevent sparks from escaping, but also contains numerous instruments that will record the spread and behavior of the fire in space. After the fire burns out the information from those instruments will be transmitted back to Earth over the next 4-8 days, before the Cygnus capsule begins its descent back to Earth on June 22. The spacecraft will burn up over the Pacific on reentry.