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It is important to know that the gas is transparent. If it was opaque like a wall, then the nebula looked like a saucer instead of a ring. The light radiation goes across the gas. It does not matter if the molecule of the gas is in the near part of the spherical shell or in the remote part; If he emits light, he will show it. It also does not matter which direction you are looking at, because it is in the form of a circular shell, whatever you are, it will appear in the form of a ring!

The outer edge of this kind of nebulae is clean but the inner shore is dusty and thick. Look at SNR 050 9, how clean is its outer edge but the inner part is dusty but not much. Why is SNR 050 9 different?
The answer is in its name only. SNR means SuperNovaRemanant. That is, the remnants of Super Nova. It is not a dead star from a tranquil regime, it is a dead star in an explosion. When this occurs physics are different. The supernova explosion is very high in the speed of the material that can be thousands of kilometers per second. It can be hundreds of kilometers / second in the death of small stars. In addition, a lot of substances float in the middle of the taro, which collides more speed than the substance emitted from the supernova explosion. From this, it is more power-packed and makes shock waves. Thin curl is formed from this.

It is important to know that the gas is transparent. If it was opaque like a wall, then the nebula looked like a saucer instead of a ring. The light radiation goes across the gas. It does not matter if the molecule of the gas is in the near part of the spherical shell or in the remote part; If he emits light, he will show it. It also does not matter which direction you are looking at, because it is in the form of a circular shell, whatever you are, it will appear in the form of a ring!

The outer edge of this kind of nebulae is clean but the inner shore is dusty and thick. Look at SNR 050 9, how clean is its outer edge but the inner part is dusty but not much. Why is SNR 050 9 different?
The answer is in its name only. SNR means SuperNovaRemanant. That is, the remnants of Super Nova. It is not a dead star from a tranquil regime, it is a dead star in an explosion. When this occurs physics are different. The supernova explosion is very high in the speed of the material that can be thousands of kilometers per second. It can be hundreds of kilometers / second in the death of small stars. In addition, a lot of substances float in the middle of the taro, which collides more speed than the substance emitted from the supernova explosion. From this, it is more power-packed and makes shock waves. Thin curl is formed from this.