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Astronomy

Trouble at first light

The question of how much light the first stars produced is fundamental to models of the Universe's development. But observations have so far failed to agree: is the answer a lot, or not very much at all?

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Figure 1: Eyes to the light.

HESS COLLABORATION

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Madau, P. Trouble at first light. Nature 440, 1002–1003 (2006). https://doi.org/10.1038/4401002a

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