... Spicules: Jets on the Sun . ... Now imagine that this pipe is filled with hot gas moving 50,000 kilometers per hour. Further imagine that this pipe is not made of metal but a transparent magnetic field . You are envisioning just one of thousands of young spicules on the active Sun . ... Spicules line the above frame of solar active region 11092 that crossed the Sun last month, but are particularly evident converging on the sunspot on the lower left. ... NASA Official: Jay Norris. ...