The word nebula means fog , dust or vapor . Running around with great speed. It can be said that these are the galaxies (galaxies ) in which the gas has not yet formed. With the help of binoculars, they saw the nebula , which they thought was a nebula . Yet his old name remains. In fact, it is right to call him the shadow path. Because there are nebulae in the sky , they can be seen with the naked eye. There is nothing wrong with their appearance. Two nebulae can be seen in the stars. It looks like a sack that encloses with a drawstring. Such is the case of a galaxy. The nebula is so large that it could accommodate thousands of solar systems.