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What is a nebula ? how does it form stars ?

Nebula are the basic building blocks of the universe. A nebula is a cloud of dust and other ionised gases like helium, hydrogen which is there in between the stars.  Nebula itself means Cloud.  It is formed when portions of space between the stars( also called intersteller space) collapse and clump together due to gravitational force of attraction of the particles.
More than one nebula is called nebulae.  

Kindly refer to the link given below for the information of formation of stars:

https://www.meritnation.com/ask-answer/question/what-is-nebulae-hypothesis/academics/2884067

https://www.meritnation.com/ask-answer/question/what-are-stars-made-up-of/science/2146841

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Nebula is an interstellar cloud that is made up of dust, hydrogen, helium and many other gases.
   In some cases stars are formed by nebula are of huge clouds of gases and dust particles.

hope this answer helps.
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