what is a nebula
A nebula is an interstellar cloud in outer space that is made up of dust, hydrogen and helium gas, and plasma.It is formed when portions of the interstellar medium collapse and clump together due to the gravitational attraction of the particles that comprise them.o, it is this dispersed matter that eventually collapses and forms a nebula. Nebulae, like the Orion Nebula, are often favorite astronomical objects of scientists who want to learn more about stellar or planetary formation.