Which came first, the stars and gas that make up a galaxy, or the giant black hole at its centre? Observations of a distant galaxy, caught as it forms, could help solve this chicken-and-egg problem.
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Haiman, Z. Caught in the act?. Nature 430, 979–980 (2004). https://doi.org/10.1038/430979a
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DOI: https://doi.org/10.1038/430979a
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