What is the relationship between nebulae, galaxies and constellations?

Nebula >; Galaxy constellations and nebulae contain almost all expandable celestial bodies except planets and comets. Their main component is hydrogen, followed by helium, and they also contain a certain proportion of metallic elements and nonmetallic elements. Since the launch of 1990 Hubble telescope, it has also been found to contain organic molecules and other substances. Nebula looks like a cloud-like object, which is a kind of non-stellar gas and dust cloud.

A galaxy in a broad sense refers to an operating system composed of countless star systems (including stars themselves) and dust (such as nebulae). For example, the Milky Way is a huge galaxy, which contains stars, interstellar gas, cosmic dust and dark matter, and is bound by gravity. Constellation is just the connection of several stars in a certain area in the sky, so people name it.

Extended data:

Constellations can be understood as naming people. Nebulae and galaxies are naturally formed. For example, Andromeda galaxy, also known as Andromeda galaxy, is a spiral galaxy with a huge disk structure, located in the direction of Andromeda, with a diameter of 220,000 light years and a distance of 2.54 million light years from the Earth. It is the largest galaxy closest to the Milky Way.

Nebula can be said to be the original home of stars in the universe. This is because gas clouds are the basis of star formation, that is to say, our sun also evolved from gas clouds. If there were no nebulae in the universe, the earth might not appear.