what is a nebula?

what is a nebula?

Although the universe is a vast empty space, the matter can be found in space. A nebula is the largest cloud in the universe. These are made of gases and dust. Nebulas have the elements they need to make stars. A nebula is many light-years long. So a single nebula can give birth to many stars.

Hydrogen and helium are the most common gases in the nebula. Because the first two elements of the periodic table, hydrogen, and helium, are so stable and simple, they are the most abundant in the universe. They are the primary fuel for the stars. In addition, A nebula contains some of the heavy elements left behind by the old stars.

Gases are not the same density throughout the nebula. As a result, the higher the density of the air, the more gravitational forces are generated. Because the air mass accumulated in those places. These places attract as much air as possible to the atmosphere, which breaks down the scattered structure of the atmosphere. As a result, the nebula, which was once a solitary cloud, collapses into a number of dense gas clouds. This is called the gravitational collapse of the nebula. Each of these small clusters later produces a star.

The birth of a star is caused by a nebula, and its end can also be a nebula. They are the final stages of the life of two particular constellations. Accordingly, the stars of the size of our Sun will become planetary nebulae after the red giant has passed, and the rest of the stars will be left behind after the supernova explosion.

All nebula can be classified into three groups

Planetary Nebula

When the sun’s size stars pass the red giant, it releases the rest of its outer surfaces like a smoke. This is known as a planetary nebula and its life span is thousands of years.

Supernova Remnants

Blue Hyper Giants When supernova explosions occur, the supernova remnants are created by gaseous shells released into outer space.

Dark Nebulae

also known as absorption nebulae.They are mainly composed of dust. They absorb light from other celestial bodies.

There are other alternative classifications. Many nebulae, including the planetary and supernova nebulae, are known as the diffuse nebulae. That is, such nebulae are widespread and have no definite limit.Diffuse nebulae are also of two types. Asteroid nebulae are also known as emission nebulae, and are reflective nebulae that reflect light emitted from other objects.

special note:

The true color of most nebulae is much less than what we see in photos. Some of their color intensities are not even sensitive to the human eye. Scientists will enhance the actual colors of these images to make it easier to study.


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