Nebula is related to ........

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Nebula is related to:

A galaxy starts to form by accumulation of hydrogen gas in the form of a very large cloud.

A distribution of matter and energy was not even in the early universe.

A light year is a measure of distance and not of time.

None of the above. ?

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Explanation:

A galaxy starts to form by accumulation of hydrogen gas in the form of a very large cloud called nebula. Eventually, growing nebula develops localised clumps of gas. These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars. The formation of stars is believed to have taken place some 5-6 billion years