Nebula are huge (a light year wide or more), thick clouds of dust and gas where stars are born or die. Stars form when hydrogen, helium, carbon and silicon are pulled together by gravity into hot clumps. This nebula called Orion. Scientists have even named some of the forming stars. The star a little left of the center up high in the nebula that has a stream of gas flowing around it is called LL Ori. The bright star in the lower left of the nebula is called LP Ori.