... A Tornado on Planet Earth . ... Large storms on Earth can spawn unusual, small, violent clouds known as tornadoes. ... IC 4603: Reflection Nebula in Ophiuchius . ... Dust, minute globs rich in carbon and similar in size to cigarette smoke, frequently starts in the outer atmospheres of large, cool, young stars. An Ion Drive for Deep Space 1 . ... A planet, a white dwarf, and a neutron star orbit each other in the giant globular star cluster M4, some 5,600 light-years away. ... Mars Simulated View . ...