Nebula can be defined as a cluster of clouds of gas and dust which mainly contains hydrogen.
A diffuse nebula has the following characteristics:
- It is a cluster of stars with clouds of dust and gas.
- thin but widespread
- Does not have a clear boundary.
Thus, by characterizing a nebula as diffuse, it is being referred to as being made from the interstellar matter that ere a result of leftover big bang gases.
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