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Question Reopened: How do Galaxies Grow?

Evidence from observations sheds doubt on cosmic cannibalism as a source for galaxy growth, suggesting that instead galaxies grow by pulling in gas from the intergalactic medium.

A quick stroll through Hubble’s archive shows a surplus of massive spiral galaxies — a tapestry of the drama of stellar birth and death across thousands of light-years. But one question remains: how do these galaxies continue forming stars at such a fast clip?

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