What does the nebula mean? Nebula is one of the celestial bodies composed of thin gas or dust. It contains 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.
Including galaxies outside the Milky Way (some past usages still exist, for example, Andromeda still used this name before Edwin Hubble discovered that it was a galaxy and was called the Andromeda Nebula). Nebulae are usually areas where stars form, such as the eagle nebula. This nebula depicts NASA's most famous image: the pillar of creation. The gas, dust and other substances formed in this area are crowded together, gathering huge mass, attracting more mass, and finally being big enough to form stars. It is understood that the remaining matter can also form planets and other celestial bodies in planetary systems.
Nebula is a cloud-like celestial body composed of gas and dust in interstellar space. The density of matter in the nebula is very low, and some places are vacuum if measured by the standards on earth. However, this nebula is very huge, often reaching dozens of light years in Fiona Fang. Therefore, nebulae are generally much heavier than the sun.
Nebulae have various shapes. Nebulae are related to stars. The gas thrown by the star will become a part of the nebula, and the nebula material will be compressed into a star under the action of gravity. Under certain conditions, nebulae and stars can be transformed into each other.
The main difference between a star and a nebula is that a spherical celestial body composed of hot gas can emit light and heat by itself; Nebula: a cloud-like celestial body composed of gas and dust; Compared with stars, nebulae have greater mass, volume and density.
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