What is nebula? please it briefly.
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Astronomy
a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter
Medicine
a clouded spot on the cornea causing defective vision.
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A nebula is just a cloud of ionized(charged) gases like helium hydrogen etc in outer space.
It usually forms when a small star like our sun uses up its energy and is at its final stage(a planetary nebula)
It can also form when a short lived star somehow explodes(supernova explosion)
There are preexisting gases in the interstellar medium. That when existing in clusters can also be called a type of nebula. Whenever these gases collapse in their gravities a new star is born
Happy to help!
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