What is the primary implication of a galaxy achieving massive size before ceasing star formation within the first billion years?

Answer

It implies either a runaway star formation burst or highly effective environmental scavenging.

For a galaxy to become massive yet cease activity so quickly suggests either that it burned through its gas via a massive burst of star formation or that an external force swept the gas clean very rapidly.

What is the primary implication of a galaxy achieving massive size before ceasing star formation within the first billion years?

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