differences between galaxies and nebulas

Galaxies are large collections of stars, gas, dust, and dark matter that are held together by gravity. They can contain anywhere from a few million to trillions of stars. Nebulas, on the other hand, are clouds of gas and dust in space. They can be found within galaxies and are often the sites of new star formation. In summary, a galaxy is a collection of various objects like stars, dust and gas, and dark matter while a nebula is a cloud of gas and dust.