None. A nebula is a cloud of gas and dust that can contain young stars, but a nebula is not a planet by any means.
A nebula contains dust and gas, which are the raw materials for forming new stars. Nebulae are regions in space where young stars are born from the gravitational collapse of these materials.
Milky way
This represents a galaxy, which is a massive collection of stars, gas, dust, and other celestial objects bound together by gravity. The Milky Way is an example of a galaxy that contains millions of stars, along with interstellar gas and dust.
A nebula is a cloud of gas and dust in space where new stars are formed. These regions are often characterized by the presence of young, hot stars surrounded by glowing gas and dark dust.
Scientists know that elliptical galaxies do not contain many young stars because observations have shown that they have mostly older stars with low levels of interstellar gas and dust needed for star formation. This lack of gas and dust suggests that these galaxies have exhausted their supply of materials for forming new stars and are no longer actively forming young stars.
Milky Way: Arms extend from a core full of black holes Elliptical Galaxy: Contains mostly older stars with a red color Irregular Galaxy: Contains dust, gas, and young stars Apex :)
A huge spiraling disk of stars, dust, and gas is called a galaxy. The Milky Way is an example of a galaxy that contains our solar system.
A stellar nursery.
Spiral Galaxies
No. They are made mainly of stars and planets. The stars and planets came from gas and dust.
Almost all of the galaxies have dust in them, most have new stars, but I think you are thinking of the Horse head nebula which is cited as a stella nursery.